JP5939533B2 - Belt type vacuum packaging machine - Google Patents

Description

In the present invention, a packaging bag filled with an article to be packaged is set on a rotating belt that rotates intermittently, a vacuum chamber that moves up and down descends and comes into close contact with the rotating belt, and air in the chamber is sucked into the article to be packaged The present invention relates to a belt type vacuum packaging machine for vacuum packaging.

FIG. 6 is a partial side sectional view of a conventional belt-type vacuum packaging machine. In this figure, 1 is a rotating belt, 2 is a driving roller for rotationally driving the rotating belt, 3 is a vacuum chamber disposed above the rotating belt, and 4 is a crank mechanism for moving the vacuum chamber up and down.

In order to fill a packaging bag with an object to be packed and vacuum-packed, a vacuum chamber 3 that moves up and down is arranged on the upper part of a short rotating belt 1 that rotates intermittently. 1 is in close contact, and the packaging bag is vacuum-packed by sucking the air in the chamber 3.

On the upper surface of the rotating belt 1, a plurality of prismatic seal stands 5 are fixed at predetermined intervals in the rotating direction of the rotating belt 1. These sealing bases 5 are arranged in the width direction of the rotary belt 1, and corresponding to the sealing base 5, an upper seal portion 6 is also provided in the vacuum chamber 3, and the sealing base 5 and the upper seal portion are provided. 6 forms a sealer that seals the bag mouth 7.

As shown in FIGS. 6 and 8, a substantially “<”-shaped inclined plate 9 that supports the bag mouth of the packaging bag 8 is fixed to the upstream side surface of the seal base 5 with bolts. The inclined plate 9 has the same length as the seal base 5 and the side opposite to the side fixed to the seal base 5 is not fixed to the rotating belt 1 and floats in a free state. ing. The following bag mouth pressing rod 10 rides on the upper surface of the inclined plate 9 from above, and the lower portion of the bag mouth seal portion of the packaging bag 8 is sandwiched and fixed by the inclined plate 9 and the bag mouth pressing rod 10.

As shown in FIG. 7, both ends of the bag mouth holding rod 10 are pivotally supported by a shaft piece 12 provided close to both ends of the seal base 5. After the bag mouth 7 of the packaging bag 8 is set on the seal base 5 before the bag mouth retainer bar 10 is pressed and sealed by the upper seal portion 6, the bag mouth 7 does not deviate from the heater surface. It is temporarily held with a metal rod.

As shown in FIG. 6, a carry-out chute 11 is inclined and provided at a lower reverse position on the carry-out side of the rotating belt 1. The sealed packaging bag 8 falls at the carry-out portion of the rotating belt 1 and is received by the carry-out chute 11.

The carry-out chute 11 of the conventional belt-type vacuum packaging machine is attached in such a manner that the bag mouth pressing bar 10 draws a rotation locus 13 as shown in FIG. 7 by the centrifugal force of the rotary belt 1 at the carry-out portion of the rotary belt 1. Flip outside. For this reason, it is necessary to attach the carry-out chute 11 so as to be positioned outside the rotation locus 13 so that the bag mouth pressing bar 10 does not contact.

As the attachment position of the carry-out chute 11, the position indicated by the phantom line in FIG. 7 is a preferred position with less impact when the packaging bag 8 is dropped. A small packaging bag is almost caught in the gap. For this reason, in order to receive the packaging bag 8 safely and reliably, the carry-out chute 11 is unavoidably attached to the lower part of the rotating belt 1 indicated by a solid line.

However, as shown in FIG. 6, when the carry-out chute 11 is attached to the lower part of the rotating belt 1, the packaging bag 8 rolls forward and falls onto the carry-out chute 11, and the drop distance becomes considerably large. The packaged items are heavy (eg broiler wings), hard (eg frozen tuna), sensitive to impact (eg oden eggs), easy to pinhole (eg gas Pack) etc., the damage was great. In addition, since the package rolls forward and drops strongly, the front and back and the posture of the package bag 8 after discharge are disjointed, and there is a difficulty in automating the inspection process and the boxing process in the next process.

As a method of improving the above conventional problems, the packaging bag is such that the bag mouth 7 is on the front side of the operator (upstream side of the rotating belt) and the bag bottom is on the side far from the operator (downstream side of the rotating belt). 8 was reversely arranged, and the bag mouth 7 was sealed on the seal stand 5.

As described above, the direction of the packaging bag 8 placed on the rotating belt 1 is reversed, and the bag mouth 7 is sealed by the sealing base 5 and the upper sealing portion 6, and then the bag bottom is removed at the carry-out portion of the rotating belt 1. If the bag is slid down from the side, the bag bottom side is not pressed by the bag mouth holding bar 10, and as shown in FIG. 7, the packaging bag 8 is slid down onto the carry-out chute 11 indicated by the phantom line without being caught in the gap. be able to. Accordingly, the packaging bag 8 can be received even at the position of the carry-out chute 11 indicated by the phantom line.

In addition, the attachment positions of the inclined plate 9 and the bag mouth holding bar 10 are reversed, and the position of the shaft piece 12 that pivotally supports both ends of the bag mouth holding bar 10 is on the upstream side of the seal base 5. In the position, as shown in FIG. 7, the bag mouth holding rod 10 does not open outward by the centrifugal force of the rotating belt 1. For this reason, since the rotation locus 13 of the bag mouth holding rod 10 is also reduced, the discharge chute 11 can be attached close to the rotating belt 1.

However, in the case of such a vacuum packaging machine in which the packaging bag 8 is reversely arranged, in the case of a liquid article to be packaged, the rotating belt 1 cannot be arranged in an ascending gradient at the operator's working position. There was a problem that it was not possible to cope with the packaged items.

Therefore, in order to improve the conventional vacuum packaging machine, a belt-type vacuum packaging machine as in Patent Document 1 has been proposed. In the belt-type vacuum packaging machine of Patent Document 1, an arm shaped like an L-shape rotated 90 degrees counterclockwise is provided at one end of an opening pressing member (bag mouth pressing bar 10). The arm is provided with a support shaft at one end, and is pivotally supported by the seal base via the support shaft.

A horizontal receiving side portion hangs below the support shaft of the arm, the horizontal receiving side portion collides with an operating pin that protrudes and is fixed to the rotating belt side near the discharge portion of the rotating belt, and the arm is centered on the supporting shaft. Rotate to. As a result, the opening pressing member (bag holding bar 10) is forcibly separated from the packaging bag after the vacuum / sealing packaging process, so that the packaging bag does not wrap around the opening pressing member. Is discharged smoothly.

Moreover, in the packaging machine of Patent Document 1, since the opening pressing member (bag mouth pressing bar) has finished rotating at the carry-out portion of the rotating belt, the rotating machine draws a rotation locus as shown in FIG. Accordingly, the interval between the carry-out chute and the carry-out of the rotary belt can be reduced, and the packaging bag is less likely to be fitted into the gap.

Japanese Patent No. 3848663

In the belt-type vacuum packaging machine of Patent Document 1, the horizontal receiving side of the arm collides with the operating pin in the vicinity of the discharge portion of the rotating belt, and the arm rotates around the support shaft. However, since the horizontal receiving side portion hangs slightly from the support shaft, the opening holding member (bag mouth holding rod 10), which is quite heavy, can be considerably rotated to rotate around the support shaft of the arm. Requires power. For this reason, when the horizontal receiving edge collides with the operating pin at the same speed as the moving speed of the belt, a strong impact is applied, so that the horizontal receiving edge and the operating pin are consumed significantly.

Furthermore, the belt-type vacuum packaging machine as in this case is not limited to long and large packaging bags, but must be compatible with thin and short packaging bags, but the clearance between the carry-out chute and the rotating belt must be about 30 mm. If it is too wide, the thin and short packaging bag may be caught in the gap. However, when the height of the opening pressing member (bag mouth pressing bar 10) of Patent Document 1 is lowered and the horizontal receiving side of the arm is shortened in order to narrow the gap, as described above, the operating pin and the horizontal receiving pin are arranged. There is a possibility that the impact with the side part is too strong to endure practical use. On the other hand, if the horizontal receiving side is suspended long and the position of the support shaft of the arm is raised from the belt surface, the gap between the carry-out chute and the rotary belt carry-out must be widened.

In order to solve the above problems, even if the mounting position of the carry-out chute of Patent Document 1 is slightly lowered, the opening holding member (bag mouth holding bar 10) is the reverse position of the carry-out portion of the rotating belt. The opening retainer (bag mouth retainer bar 10) hangs away from the belt due to its own weight, so that the opening retainer contacts the unload chute unless the unload chute is shifted downward. There is a risk of doing. Therefore, in Patent Document 1, the intended purpose of providing the carry-out chute above the carry-out portion of the rotating belt and carrying out the packaging bag softly is not achieved.

In view of the above-described problems, the present invention is such that the opening pressing member (bag mouth pressing bar 10) passes through without being reversed at the carry-out portion of the rotating belt and does not get caught even in a thin packaging bag. Place the unloading chute while holding the gap, slide down the unloading chute without the forward rotation of the packaging bag, reduce the impact of the falling of the packaging bag, and carry it out in an aligned state without at least flipping the front and back An object of the present invention is to provide a belt-type vacuum packaging machine that can be manufactured at low cost.

The present invention is a belt for placing a packaging bag filled with an article to be packaged on a rotating belt, and a vacuum chamber is in close contact with the rotating belt from above the packaging bag, and the packaging bag is vacuum-packed with a negative pressure inside the chamber. In the type vacuum packaging machine, in the width direction of the rotating belt, a seal stand for sealing the bag mouth is disposed, and along the longitudinal direction of the seal stand, the bag mouth presser bar is pivotally supported rotatably. An unloading chute is provided at the unloading portion of the rotating belt, and an inversion prevention guide is provided on the unloading side of the rotating belt to guide the passage at the unloading portion in a posture in which the bag mouth pressing bar is closed to the seal base side. Features.

According to the present invention, from the above-described configuration, the bag mouth pressing bar passes through the carry-out portion of the rotating belt in a posture in which the bag mouth holding bar is closed to the seal base side by the reversing prevention guide, and the bag mouth pressing bar opens outward to contact the carry-out chute. Therefore, the gap between the carry-out chute and the rotating belt can be narrowed, the packaging bag can easily slide down to the carry-out chute, and even a thin and small packaging bag can be prevented from falling through the gap.

The present invention is a belt for placing a packaging bag filled with an article to be packaged on a rotating belt, and a vacuum chamber is in close contact with the rotating belt from above the packaging bag, and the packaging bag is vacuum-packed with a negative pressure inside the chamber. In the type vacuum packaging machine, in the width direction of the rotating belt, a seal stand for sealing the bag mouth is disposed, and along the longitudinal direction of the seal stand, the bag mouth presser bar is pivotally supported rotatably. An inclined plate that slides down the packaging bag after vacuum packaging to the carry-out chute side is fixed on the rotating belt in the vicinity of the seal stand, and a carry-out chute is provided at the carrying-out portion of the rotating belt, and on the carry-out side of the rotating belt. , provided inversion prevention guide for guiding the passage at unloading unit to the bag mouth presser bar in the closed position on the sealing platform side, characterized in that.

If the inclined plate is not fixed to the sealing base as in the above configuration, but fixed to the rotating belt, when the packaging bag sealed by the sealing base reaches the circumferential portion on the carry-out side of the rotating belt, the upstream side of the inclined plate is Since it does not lift from the surface of the rotating belt, the packaging bag is not caught on the inclined plate. On the contrary, since the upstream side of the inclined plate is fixed to the rotating belt, the inclined plate makes it easier for the inclined plate to slide down the packaging bag after vacuum packaging toward the unloading chute like a slide.

Furthermore, when the packaging bag advances to the circumferential portion on the carry-out side of the rotating belt, a large gap is formed between the sealing base and the downstream side of the inclined plate, and the sealed bag opening separates from the sealing base. The bag mouth pressed by the presser bar is released, and the bag mouth is not caught in the bag port presser bar at the carry-out part.

The belt-type vacuum packaging machine of the present invention can dispose the packaging bag softly from the carry-out chute by disposing the carry-out chute while keeping the minimum gap with the bag mouth holding bar in the carry-out portion of the rotating belt. It is possible to carry out with reduced impact of dropping. In addition, the inclined plate makes it easier to slide the packaging bag after vacuum packaging toward the carry-out chute like a slide.

Side view immediately after vacuum packaging of the belt type vacuum packaging machine of the present invention Side view of the belt-type vacuum packaging machine of the present invention before carrying out the packaging bag Side view of carrying out the packaging bag of the belt type vacuum packaging machine of the present invention The time chart at the time of carrying out inverter control of the rotating belt of one Example of this invention Side view and partially enlarged view of the belt type vacuum packaging machine before carrying out the small packaging bag Partial side sectional view of a conventional belt-type vacuum packaging machine Explanatory drawing of operation of carry-out part of conventional belt type vacuum packaging machine Explanatory drawing which shows the effect | action of the conventional inclination board Explanatory drawing explaining the state of the belt type vacuum packaging machine of this invention Schematic explanatory drawing equipped with an inclined plate operating mechanism in the belt type vacuum packaging machine of the present invention

Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol of drawing is used about the same structure as the past. FIG. 1 is a side view showing a state in which the vacuum chamber is raised immediately after vacuum packaging of the belt type vacuum packaging machine of the present invention.

A prismatic seal base 5 is attached in the width direction of the rotary belt 1 of the belt type vacuum packaging machine of the present invention. Although not shown, an upper seal portion is provided at a position corresponding to the seal stand 5 in the vacuum chamber 3 as described in the conventional example.

On an inclined plate 9 provided along the upstream side of the seal table 5, a bag mouth holding rod 10 is arranged in parallel with the seal table 5, and both ends are pivotally supported by a shaft piece 12. The bag mouth holding rod 10 is a metal rod, has a weight sufficient to hold the bag mouth 7 of the packaging bag 8, and both end portions 15 are bent into an L shape, not shown. The distal end portion is bent inward at a right angle and is pivotally supported by the shaft piece 12. For this reason, the bag mouth pressing rod 10 can be rotated between a position on the inclined plate 9 that presses the bag mouth 7 and a release position lying on the rotating belt 1. Reference numeral 16 denotes a bag support plate for positioning the bag bottom side.

As described above, the slide-type inclined plate 9 is directly fixed to the rotating belt 1 with screws adjacent to the upstream side of the seal table 5, and is completely fixed to the seal table 5 unlike the conventional example. Absent. The inclined plate 9 is made of a long metal plate, and the inclined portion on which the opening of the packaging bag 8 is placed, and the side (upstream side) of the inclined portion far from the seal base 5 is a "<" shape. It is comprised from the fixed part of the bottom part bent inside, and the round | loop formed along the seal stand 5 side at the upper end. The operation of the slide type inclined plate 9 will be described later in detail while comparing with the conventional example.

In the present invention, as shown in FIG. 1, the bag mouth holding rod 10 is reversed on the carry-out side of the rotating belt 1 in accordance with the rotation locus drawn when the tip of the closed bag mouth holding rod 10 passes. The body frame 18 (see FIG. 6) is provided with a reverse prevention guide 17 for passing the carry-out side in a state where the bag mouth holding bar 10 is closed to the seal base 5 side.

The inversion prevention guide 17 is formed in a shape that matches the rotation trajectory of the closed bag mouth holding rod 10, and the main body frame 18 is slidably guided at one end of the bag mouth holding rod 10. Projecting inside. However, the inversion prevention guides 17 may be provided on both sides so as to slide and guide both end portions of the bag mouth holding rod 10. The inversion prevention guide 17 may be made of a synthetic resin plate or a metal plate.

Next, the operation of the reverse prevention guide and the inclined plate of this embodiment will be described. The belt-type vacuum packaging machine of Patent Document 1 has a problem in that the packaging bag 8 sealed on the sealing table is easily caught on the corner of the sealing table and is stably carried out. Further, in the vacuum packaging machine shown in FIGS. 6 and 7, as shown in FIG. 8, since the inclined plate 9 is directly fixed to the seal base 5 with bolts, the inclined plate is moved to the carry-out portion of the rotating belt 1. The side on the upstream side of 9 rises from the surface of the rotating belt 1, and the packaging bag 8 is easily caught on the inclined plate 9. Further, since the bag mouth holding rod 10 is held long in the carry-out portion, the bag mouth 7 is wrapped around the bag mouth holding rod 10 when the packaging bag 8 after vacuum packaging is carried out from the rotary belt 1 and carried out. There is a risk that it will collide with the chute 11 or fall into the gap between the rotating belt 1 and the carry-out chute 11.

In the present invention, the inclined plate 9 is fixed to the upstream rotary belt 1 close to the seal base 5. Moreover, in order to make the mounting pitch of the inclined plate 9 with respect to the seal base 5 constant or larger, a portion (upstream portion) far from the seal base 5 at the bottom of the inclined plate 9 is fixed to the rotating belt 1 as shown in FIG. As described above, even if the seal base 5 and the bag mouth holding rod 10 start to wrap around the circumferential portion on the carry-out side of the rotating belt 1, the fixed portion of the bottom portion of the inclined plate 9 is located at the entrance to the circumferential portion on the carry-out side. The packaging bag 8 is placed on the rotating belt in a horizontal state.

For this reason, the distance between the seal base 5 and the bag mouth holding rod 10 that have been turned around to the circumferential side on the carry-out side of the rotating belt 1 and the inclined plate 9 before being turned around does not simply open in the horizontal direction, Since the distance increases while the angle is added, even if the bag mouth 7 is held by the bag mouth presser bar 10, the bag mouth 7 comes out of the bag mouth presser bar 10 and separates. Therefore, the bag mouth 7 of the packaging bag 8 does not wrap around the bag mouth presser bar 10. Moreover, without being caught in the gap between the carry-out chute 11 and the rotating belt 1, it is possible to stably slide down the carry-out chute while keeping the upward posture. Further, the bag mouth 7 sticks to the seal table 5 on the seal table 5 due to the liquid or other deposits of the product, and is hardly caught in the gap.

When the packaging bag 8 advances from the position shown in FIG. 2 to the position shown in FIG. 3, the inclined plate 9 closes the gap between the rotating belt 1 and the carry-out chute 11, and the inclined plate 9 allows the packaging bag 8 after vacuum packaging to slide. It makes it easy to slide down to the carry-out chute 11 side so as to slip.

As described above, the bag mouth 7 is surely separated from the bag mouth presser bar 10 before the inclined plate 7 goes around the circumferential portion on the carry-out side of the rotary belt 1. It is not necessary to invert from the seal stand 5 side. For this reason, the inversion prevention guide 17 is provided to prevent the bag mouth holding rod 10 from being reversed at the circumferential portion on the carry-out side of the rotary belt 1, and the circumferential direction with the bag mouth holding rod 10 closed to the seal base 5 side. The bag mouth pressing bar 10 does not open outward at the reverse position of the rotating belt 1 as shown in the conventional example of FIG. Therefore, the carry-out chute 11 can be disposed close to the rotating belt 1 with a minimum gap, and the carry-out chute 11 can be attached to an ideal height that is higher than the conventional one in which the packaging bag 8 is carried out. . For this reason, when carrying out, there is no inversion of the front and back of the packaging bag 8, and it can carry out to the carrying-out chute 11 in the aligned state.

FIG. 5 is a carry-out side end portion of the vacuum packaging machine and a partially enlarged view thereof when carrying out the small-sized packaging bag 8 (bag length of about 150 mm or less). As shown in FIG. 5, when the size of the packaging bag 8 is reduced, it becomes easy to be caught in the gap between the rotary belt 1 and the carry-out chute 11, but in the present invention, the carry-out chute 11 is minimized to the rotary belt as described above. 1, and the inclined plate 9 closes the gap between the rotating belt 1 and the carry-out chute 11 so that the inclined bag 9 can smoothly carry the packaging bag 8 toward the carry-out chute 11. it can. Further, in the small-sized packaging bag 8 of FIG. 5, the bag with the inverted L-shaped bag support plate 16 is lifted so that the bottom of the packaging bag 8 floats when the packaging bag 8 is carried out to the carry-out chute 11 side. It is set higher than the height of the bottom upper surface. With the above configuration, when the packaging bag 8 is carried out, the bag bottom side of the packaging bag 8 can be lifted freely from the rotary belt 1, so that the inclined plate 9 and the carry-out chute 11 can match the same inclined surface. Thus, the carry-out chute 11 can be slid down by inclining the packaging bag 8.

If the packaged item has a certain weight, is hard, cylindrical, thick, and angular, the friction with the rotating belt 1 is strong, so even if the carry-out angle shown in FIG. Instead, it may be drawn in the vertical direction so as to be caught in the rotating belt 1 and caught on the carry-out chute 11. At that time, the rotational speed of the rotating belt is controlled, and as shown in FIG. 3, immediately before the inclined plate 9 comes close to the carry-out chute 11, the rotating belt 1 is rapidly decelerated, so that the heavy packaging bag 8 is obtained. It is possible to smoothly move on the carry-out chute by sliding on the inclined plate 9 due to inertia.

FIG. 4 shows an example of a time chart when the rotating belt of the embodiment is inverter-controlled. In the time chart of FIG. 4, after the packaging bag 8 is vacuum-packed in the vacuum chamber 3, the rotational frequency of a drive motor (not shown) that rotates the drive roller 2 is 65 Hz from the movement start point (P0) of the lower left belt. After rotating at a constant speed of 65 Hz from (P1) for a certain period of time, the rotational speed is reduced to 20 Hz between (PL), and the heavy packaging bag 8 is slid on the inclined plate 9 by inertia. And transfer onto the carry-out chute.

Then, after maintaining 20Hz slightly, it re-accelerates to 65Hz and maintains it until (P2), and the bag mouth holding | maintenance stick | rod 10 is made to pass the inversion position of the drive roller 2. FIG. Thereafter, the frequency is reduced to 20 Hz between (P2) and (P3), 20 Hz is maintained between (P3) and (P4), and then the drive motor is intermittently stopped at (P5). The reason why the rotation speed is maintained at 20 Hz in the latter half (P3-P4) of this time chart is that if the drive motor is suddenly stopped from 65 Hz in (P2), the belt stop position varies.

From the embodiment as described above, the packaging bag 8 can be softly slid down from the carry-out chute 11 on the carry-out side of the rotating belt 1, the impact of the drop is small, the front and back of the packaging bag 8 are not reversed, and the posture is also It can be carried out without being disturbed.

In the paragraph number (0033), “sliding plate type inclined plate 9 is directly fixed to rotating belt 1 with a screw adjacent to the upstream side of sealing table 5, unlike the conventional example. Is not fixed at all, ”and the advantage that the inclined plate 9 is directly fixed to the rotating belt 1 with screws is described in paragraph (0038). However, as a demerit of directly fixing the inclined plate 9 to the rotating belt 1 with a screw, as shown in FIG. 9, when the inclined plate 9 moves from the circumferential side of the driven roller 20 to a flat state, the inclined plate 9 The free end 9A of the bag 9 and the bag mouth pressing bar 10 are brought into contact with each other from a separated state, but in rare cases, the bar-shaped upper part 10A of the bag mouth pressing bar 10 is engaged with the inner side of the free end 9A of the inclined plate 9. May cause inconvenience in work.

Therefore, as shown in the driven roller 20 in FIG. 10, an inclined plate operating mechanism 21 is provided to prevent the bar-shaped upper portion 10 </ b> A of the bag mouth holding bar 10 from biting into the free end 9 </ b> A of the inclined plate 9. . FIG. 10 is a schematic explanatory diagram in which the inclined plate operating mechanism 21 of the cam mechanism is provided in the driven roller 20. The cam mechanism is a linear follower type cam mechanism. The cam 22 is fixed without rotating, and a follower lever 24 with a roller 23 is arranged in the radial direction in the drive roller 20 so that the cam 22 The outer periphery rotates around the driven roller 20.

When the inclined plate 9 reaches the circumferential portion of the rotating belt 1 on the driven roller 20 side, the follower lever 24 is pushed up by the cam 22 in the radially outward direction of the driven roller 20, and the upstream side of the fixed piece 9B of the inclined plate 9 So that a gap is not opened between the free end 9A and the rod-shaped upper portion 10A, and the rod-shaped upper portion 10A of the bag mouth holding rod 10 is not caught in the free end 9A of the inclined plate 9. The inclined plate 9 is fixed to the rotating belt 1 so that the upstream side and the downstream side of the fixed piece 9 </ b> B of the inclined plate 9 are lifted with respect to the rotating belt 1. The follower lever 24 is, for example, at one central portion in the width direction of the rotating belt 1 or at two locations on both sides.

Further, in the paragraph number (0038), “for this reason, the distance between the seal base 5 and the bag mouth pressing bar 10 that have been turned around to the circumferential side on the carry-out side of the rotary belt 1 and the inclined plate 9 before being turned around is Instead of simply opening in the horizontal direction, the distance increases with an angle, so that even if the bag mouth 7 is pressed by the bag mouth presser bar 10, the bag mouth 7 comes out of the bag mouth presser bar 10 and moves away. . " However, in rare cases, the bag mouth 7 does not come off the bag mouth presser bar 10 and does not come off.

Therefore, when the inclined plate operating mechanism 21 is provided also on the driving roller 2 side and the inclined plate 9 reaches the circumferential portion of the driving roller 2, the follower lever 24 is pushed up by the cam 22 in the radially outward direction of the driving roller 2. Then, the downstream end of the fixed piece 9B of the inclined plate 9 is pushed up, and the free end 9A is opened with a larger angle between the free end 9A of the inclined plate 9 and the bar-shaped upper portion 10A of the bag mouth holding rod 10 with a larger angle. The circumferential portion of the drive roller 2 is allowed to pass while maintaining a gap between the upper portion 10A and the rod-shaped upper portion 10A. Thereby, the bag mouth 7 can be reliably pulled out from the bag mouth presser bar 10.

The follower lever 24 rotates in synchronization with the inclined plate 9 on the rotating belt 1. However, the position of the inclined plate 9 is detected by a sensor (not shown) and is synchronized with the follower lever 24. It is preferable to configure so that the position of the follower lever 24 can be adjusted so as to move forward or backward to synchronize when it disappears. For example, the outer end side of the follower lever 24 can be moved in the front-rear direction by the actuator according to a long hole formed in the circumference of the drive roller 2 and the driven roller 20.

In the above embodiment, the inclined plate operating mechanism 21 using the cam mechanism has been described, but the present invention is not limited to such a cam mechanism. For example, the tilting plate 9 is operated using an electromagnet or a servo motor, and on the driven roller 20 side, the free upper end 9A of the tilting plate 9 is prevented from being caught by the bar-shaped upper portion 10A of the bag mouth pressing bar 10, and the driving roller 2 On the side, the bag mouth 7 can be surely pulled out from the bag mouth presser bar 10. Further, a protrusion is provided on the surface of the driving roller 2 and the driven roller 20, and the protrusion and the inclined plate 9 are synchronized to push up the upstream side or the downstream side of the fixed piece 9B of the inclined plate 9 in the same manner as the cam mechanism. It may be.

The present invention is, for example, a belt-type vacuum in which a packaging bag filled with an object to be packaged is set on a rotating belt that rotates intermittently, the vacuum chamber is lowered, and the air in the chamber is sucked to vacuum package the object to be packaged. Useful for packaging machines.

DESCRIPTION OF SYMBOLS 1 Rotating belt , 2 Drive roller , 3 Vacuum chamber , 5 Seal stand , 6 Upper seal part , 7 Bag mouth , 8 Packaging bag , 9 Inclined plate , 9A Free end , 9B Fixed piece , 10 Bag mouth holding stick , 10A Rod-shaped Upper part , 11 Unloading chute , 13 Rotating locus , 15 Both ends , 16 Bag support plate , 17 Inversion prevention guide , 18 Body frame , 21 Inclined plate operation mechanism

Claims (5)

A belt-type vacuum packaging machine that places a packaging bag filled with an article to be packaged on a rotating belt, and a vacuum chamber is brought into close contact with the rotating belt from above the packaging bag, and the packaging bag is vacuum-packed with a negative pressure inside the chamber. In
In the width direction of the rotating belt, a seal stand for sealing the bag mouth is disposed,
Along the longitudinal direction of this seal stand, pivotally support the bag mouth presser bar,
A carry-out chute is provided at the carry-out portion of the rotating belt,
Wherein the carry-out side of the rotating belt, a reversal prevention guide for guiding the passage at unloading unit to the bag mouth presser bar in the closed position the sealing strip end is provided a belt type vacuum packaging machine, characterized in that. A belt-type vacuum packaging machine that places a packaging bag filled with an article to be packaged on a rotating belt, and a vacuum chamber is brought into close contact with the rotating belt from above the packaging bag, and the packaging bag is vacuum-packed with a negative pressure inside the chamber. In
In the width direction of the rotating belt, a seal stand for sealing the bag mouth is disposed,
Along the longitudinal direction of this seal stand, pivotally support the bag mouth presser bar,
In the vicinity of the sealing table, an inclined plate that slides the packaging bag after vacuum packaging down to the carry-out chute is fixed on the rotating belt,
A carry-out chute is provided at the carry-out portion of the rotating belt,
Wherein the carry-out side of the rotating belt, a reversal prevention guide for guiding the passage at unloading unit to the bag mouth presser bar in the closed position the sealing strip end is provided a belt type vacuum packaging machine, characterized in that. A bag support plate for positioning the bag bottom side of the packaging bag is provided at a predetermined interval from the seal stand of the rotating belt, and the height of the bag support plate is taken out to the carry chute side. 3. The belt-type vacuum packaging machine according to claim 1, wherein the height is set to be higher than the height of the upper surface of the bag bottom where the bag bottom of the packaging bag is lifted. Control that rotates the rotation speed of the rotating belt and immediately decelerates the rotating belt immediately before the inclined plate comes close to the carry-out chute so that the packaging bag slides on the inclined plate due to inertia and moves onto the carry-out chute. The belt-type vacuum packaging machine according to claim 1 or 2, further comprising means. Push the downstream side of the fixed piece of the inclined plate to the carry-out side drive roller of the rotating belt, and open a gap with a larger angle between the free end of the inclined plate and the upper part of the bag mouth pressing bar. A tilting plate operating mechanism for holding the tilting plate, which pushes up the upstream side of the fixed piece of the tilting plate to the driven roller of the rotating belt and prevents the upper portion of the bag mouth pressing bar from biting into the free end of the tilting plate. The belt-type vacuum packaging machine according to claim 2, further comprising an operation mechanism .

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