JP2710643B2 - Sealing machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sealing machine that covers an opening of a tray loaded with contents and seals it with a sheet-like film.

(Prior Art) When packing meat, vegetables, mushrooms, etc., they are loaded into a tray-shaped packaging container, and a sheet-like film is adhered and sealed with an adhesive applied to the edge of the tray, or a tray. A method is adopted in which a sheet-like film is welded to the rim and sealed.

The sealing machine disclosed in JP-A-60-148410 is of a type in which a sheet-like film is bonded and sealed with an adhesive.

This sealing machine has a brush frame in which brushes are planted inward on the entire inner wall surface, and a tray receiver which is vertically movable below the brush frame. Then, the tray loaded with the contents is placed on the tray receiver, and the tray receiver is raised to push up the sheet-like film previously guided between the brush frame and the tray receiver into the brush frame on the tray upper surface. Thus, the sheet-like film is pressed against the outer wall surface of the tray by the elastic force of the brush when passing through the brush frame, and is bonded by an adhesive.

Two tray receivers are attached to a rocking body provided below the brush frame so as to be swingable in a direction orthogonal to the sheet film transport direction, and when one tray receiver is at the tray sealing position, the other tray receiver is mounted. The tray receiver is set so as to be located at the tray take-out and carry-in position, so that the sealing operation and the tray take-out and carry-in operations can be performed in parallel.

(Problems to be Solved by the Invention) However, the sealing machine has the following problems.

That is, since the two tray receivers are attached to the rocking body, the tray take-out and carry-in positions of the respective tray receivers are alternately located on both sides of the machine body, and it is extremely difficult for one worker to perform the work. Have a point. In addition, since the respective tray receivers alternately protrude to both sides of the body, there is a problem that the occupied space of the entire apparatus is increased.

Therefore, the present invention has been made to solve the above problems, and the purpose thereof is to take out a tray,
It is an object of the present invention to provide a sealing machine which can easily carry in the work and occupy a small space.

(Means for Solving the Problems) In the present invention according to the above object, a tray loaded with contents is pressed against a sheet-like film from below a horizontally guided sheet-like film, and a tray opening is formed by a seal portion. In a sealing machine that covers and seals a tray, the sealing machine is mounted on a rotating shaft via a vertical movement mechanism so as to be located on opposite sides of a rotating shaft provided in a vertical direction on the body.
A rotating mechanism that rotates the two tray receivers and the rotating shaft so that the two tray receivers are alternately rotated between the lower position of the sheet-like film, the tray removal side of the machine body, and the carry-in position. Are provided.

The tray holder is attached to the turning shaft via a parallelogram link so as to be movable up and down, and this tray holder is moved up and down by a push-up rod whose one end is pivotally mounted on the machine base and whose tip side is moved up and down by a rocking device. A mechanism can be employed.

Further, as a turning mechanism of the turning shaft, a second gear meshing with a first gear fixed to a lower portion of the turning shaft is provided on a guide portion provided on a second gear with a drive pin provided on a rotating arm of a four-joint link in a radial direction. A mechanism for engaging and rotating can be employed.

(Operation) The two tray receivers are located below the sheet-like film,
It is pivotable over the take-out and carry-in positions on the side of the machine.

Therefore, it is possible to place the tray loaded with the contents on the tray receiver at the take-out / transport position, rotate the tray receiver below the sheet-like film, and move the tray receiver up and down by the vertical movement mechanism to perform sealing. it can. on the other hand,
Since the tray receiver located at the seal position side pivots to the take-out / carry-in position, it is possible to take out the tray for which the seal has been completed and carry in the tray for the next seal.

Since the tray can be taken out and carried in on one side of the machine, the work can be performed easily. In addition, the two tray receivers are positioned below the sheet-like film around the pivot axis,
Since the swiveling is performed over the take-out and carry-in position, there is an advantage that the space can be reduced.

By moving the tray receiver up and down through the parallelogram link and the push-up rod whose tip end moves up and down by the swinging device, a deceleration action occurs at the uppermost position, and the seal at the seal portion is suitably sealed. I can do it.

Further, by performing the turning of the turning axis through the four-bar link, a two-stage deceleration action occurs at the start and stop of the turning,
Also, during the turn, a two-step speed-up action occurs, so that a smooth turn with less impact can be performed. Also, by applying a brake to the rotation of the turning axis with a braking device,
Rotation inertia can be reduced, and vibrations generated by gears and the like can be further absorbed.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

 FIG. 1 is an explanatory view showing an outline of the whole sealing machine.

A is a seal portion, B is a sheet-like film conveying device, 10
Is a tray tray.

Numeral 11 denotes a reel around which the sheet film 12 is wound, and numeral 13 denotes a take-up reel.

The sheet-like film 12 pulled out from the reel 11 is turned over by a roller 14, and is fed by a transport device 13 shown in detail in FIG.
It is wound up.

As is apparent from FIG. 2, the conveying device B includes an endless belt 16 for pressing the side edges of the sheet film 12 from above and below.
17 is provided. This pair of endless belts is also arranged on the back side of FIG. 2 in parallel with the pair of endless belts, and the two pairs of endless belts press both side edges of the sheet-like film 12 from above and below. Thus, the sheet film 12 is fed by a fixed size.

Reference numeral 18 denotes a pressing piece which is urged downward by a spring 19 to press the endless belt 16 downward from the inside, whereby the sheet-like film 12 is pressed by both belts. 20,
20 is a drive pulley.

21 is a heater plate arranged in front of the seal position,
The sheet-like film 12 is heated and softened.

As described above, the tray receiver 10 on which the tray loaded with the contents is placed is lifted from below the sheet-like film 12 which is horizontally guided on the upper part of the body 15 by the transport device 13, and is moved above the sheet-like film 12. The sheet header 12 (FIG. 1) is used to weld the sheet-like film 12 to the flange of the tray.

The mechanism of the seal will be described with reference to FIGS.

Reference numeral 22 denotes the seal header. As is clear from FIG. 4, the mounting header 24 is located above the sheet-like film 12 and in front of the heater plate 21 (forward in the feeding direction of the sheet-like film). It is attached to the machine base 15.

The seal header 22 is suspended by a spring 25 and can be pushed upward slightly against the urging force of the spring 25.

Further, the seal header 22 is formed of an aluminum alloy, a plurality of cooling fins (not shown) are formed on the peripheral surface, and the seal header 22 is formed in a frame shape. Are formed in two stages so that the outer peripheral side protrudes below the inner peripheral side. A heater wire 26 for fusing the sheet-like film 12 is provided on the bottom surface of the projecting portion on the outer peripheral side, and a heater wire 28 for fusing the sheet-like film 12 on the flange portion of the tray 27 is provided on the bottom surface on the inner peripheral side. ing.

As shown in the sectional view of FIG. 3, the tray receiver 10 has an open upper surface so that the tray 27 can be received.
When the tray 27 is placed in the tray receiver 10, a flange portion protruding outwardly is placed on the edge of the tray receiver 10. An elastic body 30 is fixed to the edge of the tray receiver 10 at the portion where the flange portion of the tray rests.

The elastic body 30 corresponds to the heater wire 28 of the seal header 22, and when the tray receiver 10 is raised, the flange of the tray and the sheet-like film are formed between the elastic body 30 and the inner peripheral side of the lower bottom surface of the seal header 22. The sheet-like film 12 is welded to the upper surface of the flange portion by the heater wire 28. A concave groove 29 is formed at the edge of the tray receiver 10 outside the elastic body 30. Rises, the outer peripheral protruding portion of the lower surface of the seal header 22 and the heater wire 26 enter the concave groove 29, and the heater wire 26
Is pressed downward to apply tension to the sheet-like film 12. In this state, the heater wire 28 is energized to seal, and the heater wire 26 is energized to blow the sheet film 12. Since tension is applied to the sheet-like film 12, a beautiful seal can be performed.

A fan (not shown) is provided on a machine in front of the seal header 22. The fan (not shown) blows air to the seal header 22 and heats up the seal header 22 when the heater wires 26 and 28 are energized. It is designed to cool.

Next, a vertical movement mechanism for vertically moving the tray receiver will be described.

4 and 5, reference numeral 31 denotes a turning shaft, which is vertically attached to the machine base 15 so as to be rotatable about an axis. 32 and 32 are bearings. Swivel block on swivel axis 31
33 is fixed, and the other end of two link arms 34, 34 each having one end rotatably mounted on the swing block 33,
Up and down moving rods 35 fixed to the lower surface of the tray receiver 10 are pivotally mounted, and constitute a parallel four-piece link.

10a is also a tray receiver, and the link arm 3 is also located at a position symmetrical with respect to the
It is attached to the turning shaft 31 via 6, 36. A cam follower wheel 37 is attached to a lower end of the vertical moving rod 35.

Reference numeral 38 denotes a push-up rod, which is pivotally mounted at one end to a lower portion of the machine base 15 by a shaft 39. Reference numeral 40 denotes a deceleration motor. A cam follower wheel 43 is attached to a rotary arm 42 fixed to the drive shaft 41, and the cam follower wheel 43 contacts the lower surface of the push-up rod 38 on the distal end side.

A swing device is constituted by the deceleration motor 40, the rotating arm 42, the cam follower wheel 43, and the like.

When the deceleration motor 40 is driven to rotate the crank arm 42 in the counterclockwise direction in FIG. 4, the push-up rod 38 rotates vertically about the shaft 39.

When the turning shaft 31 is rotated about the axis by the turning mechanism described later, and the tray receiver 10 is turned, the tray receiver 10 is at the lowest position. The lowermost position is determined by an appropriate stopper. The tray receiver 10 and the vertical moving rod 35
When the tray receiver 10 is turned, the push-up stick 38 is at the lowest position so as not to hinder the turning of the tray. When the corresponding tray receiver 10 pivots to a predetermined position below the seal header 22, the speed reduction motor 40 is driven, and the pressing rod 38 is moved as described above.
Is rotated upward about the axis 39, whereby the cam follower wheel 37 abuts on the upper surface of the push-up rod 38, and the upper push-up rod 38 is still moved upward, so that the upper surface of the push-up rod 38 rolls. By the action of the four-piece link, the vertical moving rod 35, that is, the tray receiver 10 is raised and pushed up until it comes into contact with the lower surface of the seal header 22, as shown in FIG. At this position, the speed reduction motor 40 is controlled to stop. When the sealing is completed, the speed reduction motor 40 is further rotated half a turn, whereby the tray receiver 10 is lowered. At this time, the other tray receiver 10a is located on the side of the fuselage 15, and the sealed tray is taken out of the tray receiver 10a from the opening of the fuselage 15, and the next tray to be sealed is placed in the tray receiver 10a. It is carried in manually.

It is convenient to provide a notch in a part of the side wall of the tray receiver so that the tray can be easily taken out of the tray receiver.

Since the tray receiver 10 is moved upward through the above-mentioned swinging device, the uppermost position (and the lowermost position) of the tray receiver 10
As a result, the ascending speed of the tray receiver 10 is reduced, and the tray receiver 10 gently comes into contact with the seal header 22, while the pressing force on the seal header 22 is large, which is advantageous.

Note that the tray holder 10 near the uppermost position of the tray holder 10
In order to further slow down the rise, as shown in FIG.
A cam surface 45 into which the cam follower wheel 37 falls is formed on the upper surface of the corresponding push-up rod 38, so that the rising speed of the tray receiver 10 can be adjusted.

At the position corresponding to the uppermost position of the tray receiver 10, if a circular arc surface 46 having a radius equal to the length of the rotary arm 42 is provided on the lower surface of the push-up rod 38 as shown in FIG. Even if the stop position slightly shifts, the tray receiver 10 can be stably stopped at the uppermost position.

Next, a turning mechanism of the turning shaft 31 will be described with reference to FIGS. 7 and 8. FIG.

 This turning mechanism is provided on the lower surface side of the body 15.

In the figure, reference numeral 31 denotes the above-mentioned turning shaft, and a first gear 48 is fixed to a lower end of the turning shaft. A second gear 49 meshes with the first gear 48, and is rotatably provided on a second gear shaft 51 fixed to the lower surface of the bottom plate 50 (FIG. 8).
A regulating plate 52 is fixed to the lower surface of the second gear 49 by a nut 53, and a guide hole 54 extending in the radial direction with respect to the center of the second gear 49 is provided through the lower surface of the regulating plate 52.

Next, 55 is a turning drive shaft, which is rotated by a motor with a reduction gear (not shown). One end of a link rod 57 is rotatably mounted on the other end of a revolving arm 56 having one end fixed to the revolving drive shaft 55, and the other end of the link rod 57 is connected to a bottom plate 50.
Are pivotally mounted on the other end of a rotating arm 59 that rotates about a shaft 58 fixed to the shaft. A drive pin 60 is fixed on the rotating arm 59, and the drive pin 60 is engaged with the guide hole 54 of the regulating plate 52. When the turning drive shaft 55 is driven and the turning arm 56 is rotated, the position where the link rod 57 and the turning arm 56 extend linearly (hereinafter referred to as top dead center) and the position where they overlap each other (Hereinafter referred to as the bottom dead center), the rotation arm 59 rotates, whereby the first gear 48, that is, the turning shaft 31, reciprocates via the regulating plate 52 and the second gear 49.

In this embodiment, the rotating arm 59 is connected to the second gear shaft 5.
1, the drive pin 60 and the shaft 58 are set so as to oscillate in substantially the same angle range on both sides with respect to a position where the three are in a straight line, that is, a position where the guide hole 54 faces the shaft 58 direction. In the embodiment, the rotation arm 59 is set to swing within an angle range of about 45 ° as a whole. In the embodiment, the second gear 49 swings within an angle range of 98 ° by the rotation of the rotary arm 59 by about 45 °, depending on the length of the rotary arm 59, the position of the drive pin 60, and the like. In consideration of the backlash and the like, the gear ratio of the second gear 49 to the first gear 48 was set to 90:48, and the rotation angle of the first gear 48 could be made 180 °.

Next, as is clear from FIG. 5, a turning positioning arm 62 is fixed on the turning shaft 31, and adjustment nuts 63, 63 are provided at both ends of the turning positioning arm 62 so as to adjust the protruding length.

In addition, at a predetermined position on the bottom plate 50, a positioning block 65 having a cushioning material 64 such as a rubber plate fixed on both surfaces is fixed, and the turning shaft 31 is rotated, so that the tray receivers 10 are in the sealing position and the take-out position. When turning over the carry-in position (see FIG. 5), the tip of the corresponding adjustment nut 63 comes into contact with the positioning block 65 so that the seal position (referred to as the turning position) and the take-out / carry-in position are accurately positioned. Has become.

4, a brake device C for braking the rotation of the turning shaft 31 is provided. In this brake device C, one end is fixed to the body 15 side, and a brake plate 66 in which the turning shaft 31 is inserted through a through hole provided on the other end side is pressed by brake shoes 67 fixed to the turning shaft 31 from both sides. The brake is applied to the turning shaft 31 by the friction. The brake device C is necessary to absorb vibration when the turning shaft 31 is driven via the gear mechanism.

 The detailed operation of the turning mechanism will be described below.

In FIG. 7, the position (top dead center) where the link rod 57 and the swivel arm 56 extend in a straight line and the position where the two overlap (bottom dead center) correspond to the sealing position of the tray receiver 10 and the unloading / loading position. Become.

Here, in FIG. 7, the top dead center position of the link rod 57 and the turning arm 56 (broken line position in the figure, at which position one tray receiver is at the seal position and the other tray receiver is at the take-out position). When the swing arm 56 rotates counterclockwise, the drive pin 60 is moved to the second gear 49 at the top dead center position.
, The rotation speed of the second gear 49 is low, and when the drive pin 60 is near the position indicated by the solid line in the drawing, that is, near the position on the line connecting the second gear shaft 51 and the shaft 58, the drive pin It will be understood that since 60 is close to the center of the second gear 49, the rotation speed of the second gear 49 increases, and the second gear 49 is reduced again near the bottom dead center.

Further, in the vicinity of the top dead center and the bottom dead center, the swing arm 56,
From the relationship between the link rod 57 and the link of the rotating arm 59,
The angular speed of the rotating arm 59 itself is small, and therefore the rotating speed of the second gear 49 is small. Also, at the position where the rotating arm 56 and the rotating arm 59 are substantially parallel at the solid line in the drawing, the angular speed of the rotating arm 59 is small. The rotation speed of the second gear 49 becomes maximum.

As described above, according to the turning mechanism of the present embodiment, near the top dead center and the bottom dead center, that is, near the start of turning and near the stop of the tray receiver 10, the turning speed is reduced over two steps, so that the vibration is reduced. Absorbed. Further, since the braking from the brake device C is applied, the inertia is further absorbed, the vibration is further reduced, and the vehicle is accurately positioned according to the positioning block 65 and stopped.

In the middle of the turn, the speed is increased to two speeds, so that the turning speed becomes large and the cycle time is shortened. Since the speed is reduced near the start and stop of the turn, the contents of the tray carried in at the take-out position (the carry-in position) do not move, and accurate sealing can be performed.

Although the configuration and operation of each unit have been described above, the overall operation will be outlined below.

First, the tray holder 10 that is swiveled on one side of the fuselage 15
A tray loaded with contents is loaded on top.

Here, when the switch 70 shown in FIG. 1 is pressed, a motor with a reducer (not shown) is driven, the turning arm 56 is rotated, and the turning shaft 31 is rotated by 180 ° as described above. Stops at the seal position (turning position) from the unload / load position (the motor with reduction gear stops). Further, the tray receiver 10, which was at the previous sealing position, is turned to the unloading / loading position, where the sealed tray is taken out manually and the next sealing tray is loaded.

On the other hand, the tray receiver 10 turned to the seal position is moved by the deceleration motor 40 as described above, and
38, ascending via the parallelogram link, and as described above, the tray on the seal header 22 via the sheet-like film 12.
Press 27 to seal.

When the sealing is completed, the speed reduction motor 40 is driven again, and the tray receiver 10 is lowered to the lowermost position. Here, when the above-mentioned switch 70 is pushed in, the tray receiver 10 turns again, and the tray on which the seal has been completed is taken out.

As described above, the sheet-like film 12 is fed in a fixed size by the transport device B, and is successively blown into a ladder shape by the heater wire 26 and wound up on the take-up reel 13.

Needless to say, the above series of operations can be detected by a limit switch or the like and sequential control can be performed.

In the above embodiment, the push-up stick 38, the parallelogram link mechanism, and the like are employed as the vertical movement mechanism of the tray receiver 10, but the invention is not limited to this, and a vertical movement mechanism such as a cylinder device may be employed. .

Further, the turning device of the tray receiver 10 is not limited to the above embodiment, and the turning shaft may be directly rotated by a motor. In this case, the pivot may not rotate alternately in the opposite direction, but may rotate half a turn in the same direction.

Further, as the sealing mechanism, a sealing mechanism of a type in which the sheet-like film is not welded to the tray but is bonded with an adhesive applied to the tray may be adopted. In this case, the sheet-like film may be pressed against the adhesive surface of the tray with a brush or may be pressed by vacuum suction.

As described above, the present invention has been described in various ways with reference to preferred embodiments. However, the present invention is not limited to these embodiments.
Of course, many modifications can be made without departing from the spirit of the invention.

(Effects of the Invention) As described above, according to the present invention, the tray can be taken out and carried in on one side of the machine body, so that the work can be easily performed. Further, since the two tray receivers are pivoted about the pivot axis between the lower position of the sheet-like film and the take-out / transport position, there is an advantage that the space can be reduced.

By moving the tray receiver up and down through a push-up rod whose tip end moves up and down by a parallelogram link and a swinging device, a deceleration action occurs at the uppermost position, and sealing at the seal portion can be suitably performed.

Further, by performing the turning of the turning axis through the four-bar link, a two-stage deceleration action occurs at the start and stop of the turning,
Also, during the turn, a two-step speed-up action occurs, so that a smooth turn with less impact can be performed. Also, by applying a brake to the rotation of the turning axis with a braking device,
Rotation inertia can be reduced, and vibrations generated by gears and the like can be further absorbed.

[Brief description of the drawings]

1 is a plan view schematically showing the entire apparatus, FIG. 2 is a front view of a transfer apparatus, FIG. 3 is a partially cutaway sectional view of a seal header and a tray receiver, and FIG. 4 is a vertical movement mechanism of a tray receiver. FIG. 5 is an explanatory view showing an example, FIG. 5 is a plan view thereof, FIG. 6 is an explanatory view showing another embodiment of a push-up stick, FIG. 7 is a bottom view showing an example of a turning mechanism, and FIG. Is shown. A: seal portion, 13: transport device, C: brake device, 10: tray receiver, 12: sheet film, 22:
... Seal header, 26,28 ... Heating wire, 27 ... Tray, 31 ... Swivel axis, 34,36 ... Link arm, 35 ... Vertical moving rod, 37 ... Cam follower, 38 ... Pushing rod, 42 … Rotating arm, 43… Cam drive, 48… First gear, 49…
... Second gear, 52 ... Regulator plate, 54 ... Guide hole, 55 ... Slewing drive shaft, 56 ... Slewing arm, 57 ... Link rod, 58 ...
... shaft, 59 ... rotating arm, 60 ... drive pin,
62: Positioning arm, 63: Adjusting nut, 65: Positioning block, 70: Switch.

Claims (5)

(57) [Claims] 1. A sealing machine for pressing a tray loaded with contents against a sheet-like film from below a horizontally guided sheet-like film and covering the tray opening with a sealing portion to seal the tray. Two tray receivers attached to a turning shaft via a vertical movement mechanism so as to be located on opposite sides of a turning shaft provided on the body in a vertical direction; and the two tray receivers rotating the turning shaft. To the tray below the sheet-like film,
A swivel mechanism for alternately swiveling positions over both of the carry-in positions. 2. The two tray receivers can be moved up and down via a parallelogram link formed by attaching a parallel link between a vertically extending moving rod extending downward and the pivot shaft. As a mechanism for moving the tray receiver up and down, a cam follower is provided at the lower part of each of the up and down moving rods, and a push-up rod having one end pivotally mounted at the lower part of the machine base and a tip end side capable of vertically swinging is provided,
In addition, the push-up stick abuts on the lower surface on the tip side of the push-up stick and swings up and down, and the tray receiver located below the sheet-like film is moved up and down through the cam follower from its lowermost position to the uppermost position. The sealing machine according to claim 1, further comprising a swinging device for moving the sealing machine. 3. A turning mechanism, wherein a first gear is fixed to a lower portion of a turning shaft, a second gear meshing with the first gear is provided on the body, and one end is fixed to a drive shaft provided on the body. An arm, a link rod having one end pivotally attached to the other end of the pivot arm, and a rotation arm having one end pivotally attached to the other end of the link rod and the other end pivotally attached to a shaft provided on the body. And a drive pin is provided in the middle of the rotating arm of the four-link mechanism, and the drive pin is connected to the second gear or the second gear.
3. The sealing machine according to claim 1, wherein a guide portion formed substantially in a radial direction of the second gear is engaged with a member fixed to the gear. 4. A pivoting positioning arm having a position adjusting nut provided at a tip end side thereof so as to be freely adjustable in projection length is attached to the pivot shaft, and the tip of the position adjusting nut comes into contact with the pivoting arm to stop the rotation of the tray receiver. 4. The sealing machine according to claim 1, wherein a positioning block for performing the sealing is provided on the body. 5. The sealing machine according to claim 1, further comprising a pivot shaft brake device.