JPS6340729B2 - - Google Patents

Description

[Detailed description of the invention]

[Field of Industrial Application] The present invention relates to a band guide device in a packaging machine, and relates to a band guide device for a packaging machine that forcibly extrudes a band from within an arch guide with a substantially U-shaped cross section that straddles the main body of the packaging machine, and arches an arch at the location where the band is extruded. This invention relates to a device that forcibly moves a guide away from an arch frame and expands the arch guide.

[Conventional technology]

A packaging machine equipped with an arch guide made of a flexible material having a U-shaped cross section and forming a passage for a band, as disclosed in Japanese Patent Publication No. 52-7400, is capable of controlling the state (posture, order) of the band's escape from the arch guide. In recent years, it has been frequently adopted as a method that can accurately regulate. According to this method, when the horizontal part of the band pullback side (first corner side) of the arch guide is forcibly expanded, the band remains in the U-shaped path and moves horizontally with the arch guide. It had the following characteristics. Therefore, in the above conventional example, when pulling back the band, the horizontal part of the arch guide on the band pulling back side is forcibly expanded, and a fixed horizontal pin is inserted into the sliding hole facing into the guide near this expanded part. The band is pushed out from the arch guide, and the band is configured to smoothly escape from the arch guide.
As disclosed in Utility Model Publication No. 55-43043, the horizontal part of the arch guide is forcibly expanded, and a swinging push-out pin is fitted into a notch guide groove provided at or near the first corner. A modified version is proposed.

[Problems to be solved by the invention]

In the former case, these conventional band extrusion mechanisms suffer from severe wear of the sliding hole drilled in the flexible resin arch guide by the fixed pin, and the fixed pin malfunctions due to enlargement of the sliding hole, and due to wear. The tip of the band gets stuck in the enlarged sliding hole, causing trouble in feeding and pulling back the band. When a particularly narrow band (5 mm) passes through the arch guide, the tip of the band engages with the upper or lower surface of the band passage of this guide groove, causing the band to pass through the arch guide. This had the drawback that the band became clogged and smooth band supply was not possible at all times. In addition, it is not possible to forcibly expand only the front horizontal part of the arch guide and lock the band at the first corner or the vicinity with a fixed push-out pin so that it does not move horizontally with the arch guide. This is insufficient for extrusion, and the band within the arch guide remains within the arch guide at both corners of the upper side of the arch guide and other areas when the band is pulled back, leaving the problem that the band does not escape smoothly from there. Ta. In other words, the first corner of the arch guide is the position where the strongest force is applied to the band when the band is pulled back, and even if the horizontal part of the arch guide is moved,
Since the arch guide is made of flexible resin that bends in six directions, the first corner part is not necessarily expanded beyond the band width, and as a relative relationship of the horizontal transition of the horizontal part of the arch guide, Even when the fixed extrusion pin at the first corner is moved forward, the band at that section does not smoothly escape from the U-shaped opening surface, and when the band is pulled back at each corner, the band is guided by the U-shaped arch. Because the band is stuck to a piece in the center direction of the arch, it may not be possible to get a tight grip on the band's escape. This problem often occurs particularly when a narrow band is used, in which the length of the arch guide in the width direction of the band path is wider than the band width. Furthermore, according to the above-mentioned conventional technology, the arch guide can be manufactured from synthetic resin at low cost, but it has various drawbacks because it uses a flexible material and is integrally molded. It is. In other words, since the plastic band is extremely hard, when the band escapes from the arch guide, the band rubs against the opening edge of the arch guide, causing damage such as abrasion cracks to the arch guide, and is easily deformed, so the band passage The U-shaped gap that forms the band becomes narrower, making it difficult for the band to run. In addition, since it is molded in a series using flexible material, it is manufactured only for specific arch sizes, which requires a mold for each arch size, which is uneconomical, and because it is impossible to maintain a loop shape if the arch size is made large. It also has the disadvantage that it cannot be made large and cannot meet such needs. The present invention was developed in order to eliminate the drawbacks of the band extrusion mechanism in the above-mentioned U-shaped cross-section arch guide. The arch guide itself at the pushed out area is moved horizontally and forcibly expanded.

[Means to solve the problem]

To explain the configuration of the present invention for achieving the above object, the arch guide 14 having a U-shaped cross section is connected to the spring 15.
In the packaging machine, the arch guide 14 is suspended and supported horizontally movably on the arch frame 13 via a The other ends of the horizontal left and right bandways arranged so that one end communicates with the tips of the lower left and right curved portions face both ends of the slide table 16, respectively, and enter the entire widthwise length of the band passage of the arch guide 14, In addition, a plunger 61 that can be freely retracted out of the band passage is attached to the arch guide via a bracket, and the plunger 61 pushes the band from the arch guide 14 toward the inner wall of the arch frame 13, and forcibly closes the arch guide 14 in that part. The arch frame is characterized in that it is configured to be horizontally moved in the opposite direction of the arch frame and expanded.

[Effect]

Therefore, according to the present invention, when the tip of the plunger enters the opening surface of the arch guide, the band in the arch guide is pressed against the inner wall of the arch frame, and the band is pushed out of the band passage, and this reaction causes the arch guide to The band is pushed out by horizontal movement, and at the same time, the arch guide at the part where the band was pushed out is forcibly moved in the opposite direction of the arch frame, and the arch guide at that part is pushed and expanded, so that the band is pushed out from the arch guide. Escape smoothly.

【Example】

The details of the present invention will be explained below based on the drawings showing embodiments. FIG. 1 is a schematic diagram showing the entire packaging machine, and the main body 10 equipped with a band reel 11 houses various mechanisms necessary for packaging such as known band supply, tightening, and welding mechanisms as described above, and a pool box 12. Furthermore, an arch frame 13 is provided over the main body 10. The arch frame 13 has a cross section L
The frame bodies are butted together to form a U-shaped cross section with the opening facing toward the upper surface of the main body, and therein are arch guides 14 and springs 15, 15 that support the arch guides 14 so as to be movable in the horizontal direction. , a band extrusion mechanism 60, which will be described later, is attached. One end of the springs 15, 15 is attached via a bracket above the left and right straight parts of the arch guide 14,
The other end is attached to a substantially corner portion of the arch guide 14. That is, the arch guide 14 is made of a metal material such as aluminum and has a U-shaped cross section forming a band passage with a width slightly higher than the thickness of the band B used and slightly larger than the width of the band B, and the entire arch guide 14 is made of a metal material such as aluminum. It is curved at both left and right ends above the arch frame 13 and at both ends of the upper surface of the main body 10, and the springs 15, 15 cause the U-shaped opening surface of the arch guide 14 to contact the inner wall of the arch frame 13. The arch guide 14 is urged to come into contact with the arch guide 14 and is suspended and supported within the arch frame 13. Further, near the curved portion of the upper side of the arch guide 14, a band extrusion mechanism 60 including a plunger, which will be described later, is installed. A forced expansion mechanism and a swingable support member for the first corner of the arch guide, which will be described later, are connected to the open end sides of both lower curved parts of the arch guide 14, and the arch guide 14 is supported from below within the arch frame 13. are doing. In addition, left and right flaps 17 and 18, which can be opened and closed, are attached to the upper surface of the main body 10 at the open ends of both lower curved portions of the arch guide 14, with one end facing the open end and the other end facing the lower surface of both ends of the slide table 16, respectively. Together with the arch guide 14, it forms a series of band passages in which the band is arranged in a loop around the object to be packed. FIG. 2 shows the first part of the band guide device according to the present invention.
This shows an embodiment, in which a solenoid 60 is attached via a bracket 70 in a direction opposite to the opening surface of the arch guide 14. The bracket 70 is
From a U-shaped frame body in which an L-shaped plate is butted against grooves 21 formed in a trapezoidal manner in the longitudinal direction of the upper and lower surfaces 22, 23 of the arch guide 14 located on both outer sides of the band passage of the arch guide 14. The solenoid 60 is fixed to the arch guide 14 via the bracket 70. That is, the insertion hole 62 is bored in the side wall of the arch guide 14, and the insertion hole 62
A plunger, that is, a movable iron core 61 of the solenoid 60 is inserted into the hole, and the tip of the plunger 61 reaches the U-shaped opening surface of the arch guide, and the tip is flush with the side wall of the arch guide having the insertion hole 62. It is attached so that it can freely move forward and backward along the entire length of the band passage in the width direction between the positions. The diameter of the insertion hole 62 is slightly larger than the height of the U-shaped opening surface, and if an arc-shaped notch corresponding to the insertion hole is carved on the band passage surface, this portion becomes a guide for the plunger 61, and the plunger can be smoothly advanced and retreated, and
At the same time, the plunger advances throughout the band path in the vertical direction, ensuring that the band is pushed out. A locking member 63 such as an E-ring is fitted to the rear end of the plunger 61 of the solenoid 60, and a spring 64 is interposed between the locking member 63 and the rear surface of the main body of the solenoid 60, so that the plunger 61 is guided in an arch during normal times. 14 in the opposite direction, the plunger 6
The tip of the arch guide 14 holds the band passage in the arch guide 14 at a position where it does not come into contact with the advancing band.
In Fig. B, reference numeral 19 denotes a stopper, which has a cylindrical rubber attached to its tip and is fixed to the inner wall of the arch frame 13 in order to restrict the horizontal movement distance of the arch guide 14. FIG. 3 shows a second embodiment, in which the plunger 61
The tube 7 is fitted through the bracket 70.
One end of a wire 72 moving back and forth within the arch guide 14 is fixed, and the wire 72 connects the insertion hole 62 within the arch guide 14.
The plunger 61 is mounted so as to move forward and backward along the entire width direction of the band passage, and the end of the tube 71 is attached to the frame 7 attached at an appropriate position on the packing machine body.
3, and the rear end of the wire is attached to an arm 33 of a band guide 55, which will be described later.
See Figure B]. Figures 4A and B are partially enlarged views of arrow Y in Figure 1.
In the lower right curved part of the arch guide 14, the tip of the upper surface 22 of the arch guide 14 is cut into a triangular shape.
The tip of the lower surface 23 of the arch guide 14 ends at a position facing the tip of the horizontal right bandway 24 of the right flap 18 whose rear end faces the slide table 16. An engaging piece 39 of slightly thick synthetic resin having a shape corresponding to the triangular shape of the tip is fixed on the upper surface 22 of the arch guide 14, and the tip of the right flap 18 facing the tip of the upper surface 22 is fixed to the tip of the right flap 18 as shown in FIG. It is bent upwards. Further, the right flap 18 is rotatably attached to the right bandway 24 via a bracket having a spring so as to open upward from the plane of the figure. That is, the right flap 18 is an L-shaped flap that alternately overlaps the right bandway 24 having an L-shaped cross section and covers the right bandway 24 so as to form a band passable gap similar to the band passage of the arch guide 14. It is urged to be closed during normal times by the spring, and when the arch frame 13 moves horizontally, the tip of the right flap 18 is pushed by the tip of the engagement piece 39, and a force is applied in the rotation direction. Become. As shown in FIG. 4B, the curved portion of the arch guide 14 extends in the direction opposite to the opening surface of the arch guide 14.
The plate spring 41 is clamped and supported by a fixture 40 attached via a bracket 43, and the lower end of the plate spring 41 is attached to a support piece 42 provided at the base of the arch frame 13. The opening on the tip side of the curved part of the arch guide 14 is connected to the arch frame 1.
It is in contact with an L-shaped bandway 25 that is connected to 3. Figure 5 A to D are arrow view X in Figure 1 (first corner part)
This partial view shows a forced expansion mechanism of the first corner portion of the arch guide 14 on the band pulling back side. The left flap 17 is constructed in substantially the same manner as the right flap 18, and is disposed such that its tip faces the slide table 16 and its rear end faces the tip of the left curved portion of the arch guide 14. However, the left flap 17 is supported via a bracket having a spring so as to rotate in a direction opposite to the moving direction of the arch guide 14 to open the left bandway 26. That is, a rotary piece 27 is attached to a position near the slide table 16 below the left bandway 26 via a bracket 45, and rotatably supports the intersection of the T-shaped plate pieces. A spring 28 and one end of a wire 29 are attached to both ends of one orthogonal piece of the way 26, respectively. The other end of the spring 28 is attached to a bracket 31 attached to the lower surface of the left bandway 26 toward the end of the arch guide 14. Further, one piece parallel to the left bandway 26 is further bent on the slide table 16 side below the left bandway 26, and one end of the spring 34 is in contact with this bent portion 32. This spring 34
moves forward and backward on the bottom surface of the slide table 16, and is located on the bottom surface of the slide table 16 only when supplying the band, and retreats when the band tip reaches the gripping mechanism.
When the welding of the band overlapping part and the cutting of the supply end are completed, the arm 33 is attached to the known band guide 55 which returns to the old position, and the rotating piece 27 is rotated by the swinging of the arm 33. The contact is released and the spring 28 rotates counterclockwise in FIG. 5A. The communication portions of the left flap 17 and the arch guide 14 each form an oblique side having an acute angle in the direction of movement, and the left bandway 26 and the support piece 35 form a series of band passages. Also, the arch guide 14 at the first corner is a fixture whose lower end is attached to a support piece 35 in the main body connected to the arch frame 13 covering the opening surface of the arch guide 14, substantially similar to the aforementioned fixture 40. It is movably supported by 51. On the other hand, on the support piece 35 to which the fixture 51 is attached, abutments 36 and 3
6' is provided protrudingly, the substantially central portion of the crank 53 is pivotally supported on the support base 36, and a fixed piece is fixed to one end of the crank 53 in a direction opposite to the opening surface of the tip of the arch guide 14 at the first corner portion. At the other end of the crank 53, one end of an interlocking rod 54 is pivotally supported, and the other end of the interlocking rod 54 is supported by a support piece 35.
The rotating piece 49 projects in the opposite direction through an insertion hole formed in the same direction, and is pivotally supported at the end of a rotary piece 49 rotatably supported on a support base 36 projecting in the same direction.
The other end of the wire 29 is fixed to the other end of the rotating piece 49. That is, the fixed piece 52 is the rotating piece 2.
Wire 2 linked to the counterclockwise rotation of 7
9, the first corner portion of the arch guide 14 is forcibly expanded. Reference numeral 37 denotes a spring hook which, via the spring 38 having a weaker resistance than the spring 28, closes the arch guide 14 during normal times, that is, moves the U-shaped opening surface of the arch guide toward the arch frame 13 or the support piece 35. Press and energize. Next, the operation of the above embodiment will be described. Due to the forward rotation of the feed roller, the left flap 17
The band is supplied to the arch guide 14, which forms a U-shaped band passage, and reaches the bottom surface of the slide table 16 via the right flap 18.If you turn on the start button now, the camshaft will rotate and the band guide At the same time as the band 55 moves backward in the plane of the first drawing, the tip of the band is gripped and fixed by the gripping mechanism. Since the arm 33 moves upward in the paper plane of FIG. 5A due to the retreat of the band guide 55, this arm 3
The spring 34 attached to the spring 3 also moves in the same direction, and the spring 28 pulls the rotating piece 27 in the same direction due to its resistance, causing the rotating piece 27 to rotate counterclockwise in the figure. Since the wire 29 with one end attached to the rotating piece 27 moves to the right in the figure, it pulls the rotating piece 49 at the first corner in the same direction and cranks the rotating piece 49 via the interlocking rod 54 pivoted on the rotating piece 49. 53 rotates counterclockwise about the support shaft, the fixed piece 52 moves upward in the figure, forcing the opening surface of the tip end of the arch guide 14 at the first corner to be separated from the support piece 35. In this way, the arch guide at the first corner is forcibly expanded. At the same time, in FIG. 2, the solenoid 60 is energized by a signal from a limit switch (not shown) provided on a camshaft that detects gripping of the band tip, and the plunger 61 moves against the spring 64 into the band passage of the arch guide 14. and presses one side edge of the band in the band passage in the width direction and presses the other side edge against the arch frame 13. At this time, the tip of the plunger 61 has advanced to the edge of the opening surface of the arch guide 14. Therefore, the arch guide 14 in this portion moves in the opposite direction to the opening surface due to the reaction of this pressing, and the band in this portion becomes exposed between the opening surface of the arch guide 14 and the arch frame 13. In addition, in FIG. 3, the band guide 55
As the arm 33 moves forward in the plane of the drawing, the wire 72 attached to the arm 33 is pushed inside the tube 71 and moves, causing the plunger 61 to advance into the band passage, thereby moving the band toward the arch frame. Extrusion and forcible movement and expansion of the arch guide in the area in the opposite direction of the arch frame will be performed. The above steps are performed in an instant. At the same time as the tip of the band is gripped and fixed, the feed roller is reversed and the band is pulled back, so that the band begins to escape from the forcibly expanded first corner, which has the least resistance in the entire band path. At this time, left flap 17 and arch guide 1
The surfaces where the ends of the left flap 17 and the arch guide 14 face are in opposite directions, so the arch guide 1 is forcibly moved.
The band in the band passage at the tip of the left curved part 4 is locked to the end of the left flap 17 and is connected to the arch guide 14.
This effectively prevents the band in the passageway from moving horizontally together with the arch guide 14. The band that escaped from the first corner sequentially pushes and expands the arch guide 14 by the retracting force of the feed roller, and the plunger 61 of the solenoid 60 causes the arch guide 14 to expand.
4 is pushed out and the pushed out bands sequentially escape from the arch guide 14, and the part where the bands of the arch guide 14 have finished escaping is the arch frame 13.
The spring 15 is biased in a direction to bring the opening surface into contact with the inner wall, and the band is held between the arch frame and the arch guide opening surface in the width direction of the band by this band pulling force and the spring 15. The evacuation posture of the band and the evacuation order are regulated so that the band can escape while being stopped. When the band escapes to the position shown by the arrow Y in FIG. The engagement piece 39 provided on the triangular portion facing the tip of the upper surface 22, that is, the end of the right flap 18, engages the right flap 18 in that portion.
Push open upwards on the paper in Figure 4A to make it easier for the band to escape at the horizontal portion. During this time, the left flap 17 rotates against the resistance of the tension of the bracket attached to the left bandway 26, and the left bandway 26 is opened, and the band escape is completed. The solenoid 60 is the arch guide 14
The current is de-energized by a timer signal whose set time is a certain period of time based on the arch size and the rotational speed of the band rewinding mechanism until the end of the band evacuation, and the plunger 61 is returned to its previous position by the spring 64. Then, the arch guide 14 in that part returns to its old position. When the band is wrapped around the item to be packed and tightened even more, the end of the band is unwound and gripped and fixed.
After the welding of the band overlapping part is completed, the band guide 55
When the arch guide 14 at the first corner returns, the rotating piece 27 and the crank 53 interlocked therewith return to their original positions and come into contact with the arch frame 13 and the support piece 35. In the case of using the band extrusion device shown in Fig. 3,
As the band guide 55 retreats, the wire 72 in the tube 71 fixed to the frame 73 is pushed by the arm 33, the plunger 61 in the bracket 70 pushes out the band in the arch guide 14, and the band is pushed out by this reaction. Press and expand the arch guide with the part that is widened. Then, the band guide 55 returns to the lower part of the slide table, and as the wire 72 is pulled back, the band guide 55 returns to its original position. He returned to his old position in order to form a Next, the band is supplied into the arch guide 14 which forms the band passage for the next packing, and one packing process is completed. The above packing process takes approximately 2.5 seconds.

【effect】

As described above, the present invention uses the plunger to push the band and the arch guide toward the inner wall of the arch frame from the entire width direction within the band passage, and forcibly moves and expands the arch guide in this area, so that the arch guide can be reliably guided. The band can escape more easily,
In addition, it is possible to solve problems such as locking of the band tip and malfunction of band extrusion due to increased wear of the sliding hole or guide groove formed in the arch guide by the fixed pin or the fixed extrusion pin.

[Brief explanation of the drawing]

The figure shows an embodiment of the invention. Fig. 1 is an overall view of a packaging machine equipped with a band guide device according to the present invention, and Fig. 2 shows a first embodiment.
is a partial perspective view of arrow A in Fig. 1, and B is a partial perspective view of Fig. 1 B-
3 is a perspective view of essential parts showing the second embodiment, FIG. 4 is a partially enlarged view taken in the direction Y in FIG. 1, A is a plan view, B is a side view, and FIG. The figures are a partial view taken in the direction of arrow X in FIG. 1, where A is a partially enlarged plan view, B is an exploded perspective view, C is a sectional view taken along the line A--C in the same figure, and FIG. 1D is a partially enlarged side view. 10...Body, 11...Band reel, 12...
...Pool box, 13...Arch frame, 1
4... Arch guide, 15... Spring, 16... Slide table, 17... Left flap, 18...
Right flap, 19... Stopper, 22, 23...
...Arch guide upper and lower surfaces, 24...Right bandway, 25...Bandway, 26...Left bandway, 27...Rotating piece, 28...Spring, 29...
Wire, 31...bracket, 32...bending part,
33... Arm, 34... Spring, 35... Support piece, 36... Abutment, 37... Spring hook,
38... spring, 39... engaging piece, 40, 51...
Fixing tool, 42... Support piece, 43, 70... Bracket, 49... Rotating piece, 52... Holding piece, 53...
... Crank, 54 ... Interlocking rod, 55 ... Band guide, 60 ... Solenoid, 61 ... Plunger, 62 ... Insertion hole, 63 ... Locking member, 64 ...
Spring, 70...Bracket, 71...Tube,
72...Wire, 73...Frame.

Claims (1)

[Scope of Claims] 1. An arch guide having a U-shaped cross section is suspended and supported on an arch frame via springs so as to be horizontally movable, and the U-shaped opening surface of the arch guide is brought into contact with the inner wall of the arch frame to form a band passage. In the packaging machine, the other ends of the horizontal left and right bandways, which are arranged so that one end communicates with the tips of the lower left and right curved parts of the arch guide, face both ends of the slide table, respectively, and the band passage of the arch guide is provided. A band guide device for a packaging machine, characterized in that a plunger is attached to the arch guide via a bracket, the plunger being able to enter the arch frame along its entire length in the width direction and retract out of the band path. 2. The band guide device in a packaging machine according to claim 1, wherein the arch guide is made of a metal material. 3. A band guide device in a packaging machine according to claim 1, wherein the plunger is attached near the left and right curved portions of the upper side of the arch guide. 4. A band guide device in a packaging machine according to claim 1 or 3, wherein the plunger comprises a movable iron core of a solenoid.