JPH0648422A - Packing material heat-sealing device - Google Patents

Abstract

PURPOSE:To provide a bag packing machine wherein heating time for a packing material can be lengthened without lowering the efficiency. CONSTITUTION:When a seesaw beam 59 is oscillated centrated on shaft 58 by a cam 57 on one side, a belt 64 is moved up and down and a pulley 61 is riversed. The motion of the pulley 61 is transmitted to a transmission shaft 45 through a spline shaft 55 having a slide relationship to the pulley 61, so as to rotate a bell crank 46. Thereby, upper and lower seal bars 36, 37 are approached or separated through links 47, 48. On the other hand, a lever 15 is oscillated by the rotation of a cam 14 on the other side, and a block 12 provided with the seal bar is reciprocated along a guide rod 11 in the same direction as that of a packing material 33. Accordingly, the cam 14 can make the return speed of the block 12 high, so that moving time can be obtained longer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a tubular film which accommodates a large number of articles to be packaged at equal intervals and which is conveyed in the longitudinal direction. The present invention relates to a device that is heated by being squeezed by a seal bar.

[0002]

2. Description of the Related Art Generally, a packaging machine is provided with a sealing device as described above to make a film into a bag. In this case, a film having poor welding conditions is shown in FIG.
The propeller 3 is rotated by the center shaft 2 of the semi-cylindrical groove cams 1 and 1, and the pair of seal bars 4 and 4 are revolved along the groove cam 1 by the rotation of the propellers, and the film 5 is heated for a long time. And pressure.

[0003]

However, in the above device,
The length of the straight portion 6 of the groove cam 1 is the rotation angle of the shaft 2, that is, 3
There was a drawback that the film could not be formed in a quarter or more of the 60-degree angle, and as a result, heat could not be applied to the film for a longer time.

[0004]

According to the present invention, the heat is applied to the film for a longer time without lowering the operating speed of the seal bar.
A pair of guides installed in parallel on both sides of the transport path of the packaging film, a pair of blocks for supporting the sealer slidably supported by the both guides, and a swing of the first lever operated by rotation of a continuously rotating cam. A means for transmitting the operation to the both blocks to reciprocate the blocks along the guides; a pair of upper and lower seal bars erected vertically slidably on a pair of guides respectively erected on the both blocks; Four links for connecting both ends of a pair of bell cranks fixed to both ends of a transmission shaft supported between both blocks and both ends of both seal bars, and rotatably supported by a bearing plate formed in the block, A bevel gear meshed with a pinion provided on the transmission shaft, a spline shaft having one end fixed to the bevel gear, and a first bevel gear provided on the same shaft as the first cam. A belt that engages the swing end of a seesaw rod that swings due to the rotation of a cam and the spline shaft that slidably engages the center hole of a pulley that supports the belt, and the swinging action of the seesaw rod causes It is configured to invert the spline axis.

The invention of claim 2 is the first aspect of claim 1.
A slider in which a screw rod is rotatably installed along a lever, a slider is supported by the screw rod, and a pin of the slider and a block for supporting a sealer are connected via a link mechanism, and the slider is displaced by the operation of the screw rod. By changing the swing width of the pin, the reciprocating movement amount of the block is adjusted correspondingly.

Further, in the invention of claim 3, the link for connecting both ends of the bell cranks provided at both ends of the transmission shaft to the upper and lower seal bars in order to avoid collision with the transmission shaft. It is configured to be curved outward.

[0007]

According to the present invention, the movement of the first lever 15 which is rocked by the rotation of the first cam 14 is performed by the link mechanisms 16, 17, 2
It is transmitted to the sealer supporting block 12 via 0 and 21, and the block 12 is reciprocated along the guide 11 by the swing width of the first lever 15. On the other hand, the second cam 57
The movement of the seesaw rod 59 oscillated by the rotation of the belt pulls the belt 64 up and down and is transmitted to the spline shaft 55 via the pulley 61 as a reversing motion. Alternately rotate. The bevel gear 52 is the bearing plate 5 of the block 12 described above.
Since it is supported by 0, the bevel gear 52 reciprocates integrally with the block 12 and reverses. Further, the movement of the bevel gear 52 is transmitted to the transmission shaft 45 via the pinion 54, and the bell cranks 46 at both ends of the transmission shaft are reversed, so that the both ends of the bell crank 46 move in opposite directions. Is transmitted to the upper and lower seal bars 36 and 37 via links 47 and 48, respectively, to bring the both seal bars 36 and 37 into and out of contact with each other. Since the first cam 14 and the second cam 57 rotate synchronously, when the block 12 moves forward, the film 33 is pinched by the seal bars 36 and 37, and when the block 12 moves backward, the seal bars 36 move. It is possible to release the pinching pressure of the film.

According to the second aspect of the invention, the first lever 15
Since the slider 24 can be moved by operating the threaded rod 23 provided on the slider, the swing width of the pin 25 formed on the slider can be changed. Therefore, the swing width of the pin changes the reciprocating motion amount of the block 12. Eventually, the length of the bag formed corresponding to the size of the packaged object wrapped in the film can be adjusted.

Further, in the invention of claim 3, the link 47,
Since 48 is curved outward to avoid collision with the conduction shaft 45, the bell crank 46 can be rotated by 180 degrees.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS. 1 and 2, two rod-shaped guides 11 are horizontally and parallelly provided on a machine base 10 via brackets 10a, and a block 12 is slidably supported on both guides. There is. Further, a first lever 15 is engaged with a cam 14 which is continuously rotated by a main shaft 13 via a cam floor 22, and an upper swing end of the first lever and an operation piece 16 are connected via a lot 17. . Therefore, when the cam 14 makes one rotation, the first lever 15 swings only once around the pin 18 at the lower end thereof, and the swinging motion of the first lever 15 is transmitted to the operation piece 16 via the lot 17. The shaft 19 that is transmitted and supports the lower end of the operation piece 16 is inverted. Two levers 20 are supported on the shaft 19 with a predetermined space therebetween, and both second levers 20 and both blocks 12 are connected to each other via a connecting rod 21. Therefore, the inversion movement of the shaft 19 causes the second lever 20 to swing, and the block 1
2 is reciprocated along the guide 11. As shown in detail in FIG. 3, a screw rod 23 is rotatably provided on the first lever 15, and one end of the lot 17 is engaged with a pin 25 of a slider 24 engaged with the screw rod 23. Therefore, by rotating the screw rod 23 with the handle 26, the slider 24 is displaced in the vertical direction as indicated by the arrow 27, and the swing width of the operation piece 16 can be arbitrarily adjusted. The reciprocating width of the block 12 in FIG. 2 changes accordingly. The endless groove 30 formed in the cam 14 as shown in FIG.
The shape is such that the lever 15 is moved in the direction of 1 and the first lever 15 is retracted in the remaining one-third winding range 32.
That is, in the range 31 of 1, the block 12 moves in the same direction 34 as the film 33 in FIG. 1, and in the range 32 of 2, the block 12 moves backward in the opposite direction. Therefore, the backward speed of the block 12 is twice the forward speed. In FIG. 3, the time required for the reciprocating motion of the block 12 does not change even if the slider 24 is moved in the direction of the arrow 27 and the swing width of the first lever 15 is changed according to the size of the article to be packed in the film. . After all, as described later, the time required for sealing is always constant.

As shown in FIG. 5, the above two guide bars 1 are provided.
The pole 35 on the two blocks 12 supported on
A member 3 that supports the upper and lower seal bars 36 and 37
Both ends of 8 and 39 are slidably supported by the both poles 35. In addition, the vertical plates 41 fixed to the blocks 12 with screws 40 are provided with long holes 42, 4
3 is formed, and both ends of the seal bar support members 38 and 39 are projected to the outside of the elongated holes 42 and 43. Further, a transmission shaft 45 is rotatably provided between the both blocks 12 via a ball bearing 44, and both ends of a bell crank 46 fixed to both ends of the transmission shaft, respectively.
The seal bars 36 and 37 are connected to both ends thereof by links 47 and 48 of two large and small different lengths. As shown in FIG. 6, the links 47 and 48 are curved outward so as to avoid collision with the conduction shaft 45. Therefore,
When the bell crank 46 is rotated clockwise at
Since motions in different directions are transmitted to the upper seal bar 36 and the lower seal bar 37 via the links 47 and 48, the seal bars 36 and 37 are separated from each other. When the bell crank 46 is rotated counterclockwise by 180 degrees, both seal bars 36 and 37 come close to each other as shown in FIG.

As shown in FIG. 5, the spline shaft 55 is rotatably supported by the bearing plate 50 formed on the block 12 on one side, and the bevel gear 5 is provided in the middle of the spline shaft.
The bevel gear 55 is engaged with the pinion 54 which is fixed to the end of the transmission shaft 45 with the key 53. As shown in FIG. 1, the spline shaft 55 is slidably engaged with the center hole of a pulley 61 rotatably supported by a bearing 60 fixed to the machine base 10, while the first cam 1
The second cam 57 provided on the same shaft as that of No. 4 engages one end of a seesaw rod 59 having a center shaft 58 supported by a machine base, and the other end 62 of the same seesaw rod is wound around two pulleys 61, 63. It is engaged with the attached endless belt 64. Therefore, the second cam 5
By the rotation of 7, the end 62 of the seesaw rod 59 moves up and down, and the pulley 61 is reversed in the forward and reverse directions via the belt 64, so that this movement is caused by the spline shaft 55, the bevel gear 52,
54 to each of the bell cranks 46. As a result, the upper and lower seal bars 36, 37 move away from each other and approach each other. When the block 12 reciprocates along the guide rod 11, the spline shaft 55 slides inside the pulley 61.

[0013]

According to the present invention, the first cam 14 and the second cam 57 are synchronously rotated by the same shaft 13, and the block 12 for supporting the sealer is reciprocally moved by the rotation of the first cam 14.
The second cam 57 allows the upper and lower seal bars 36 and 37 to come into contact with and separate from each other. The movement of the seal bar in the same direction as the film and the timing of the engagement of the upper and lower seal bars are always synchronized. Yes, the first cam 14
With this rotation, the backward speed of the block 12 can be made higher than the forward speed. Therefore, by adopting such a configuration, more than half of one rotation of the first cam 14 can be directed to the forward direction. , The block 1 is provided by the seal bars 36 and 37 which act in synchronization with the reciprocating motion of the block 12.
It is possible to heat the film most of the time when the film No. 2 is moved forward, and there is an effect that heat can be applied to the film for a longer period of time than before.

In the invention of claim 2, the first lever 15
By operating the screw rod 23, the reciprocating width of the seal bars 36 and 37 along the film transport direction can be easily adjusted according to the length of the packaged object.

Further, according to the third aspect of the invention, the bell crank 46 can be rotated within a range of 180 degrees, and the seal bar can be operated from the top dead center and the bottom dead center of the bell crank. The impact is small and you can drive at high speed.

[Brief description of drawings]

 1 is a side view showing an embodiment of the present invention. 2 is a plan view of the previous figure. 3 is an explanatory view of the crank device. 4 is an explanatory view of the cam in the front device. 5 is a front view of the whole. Figure 6 Action diagram of the seal bar. Figure 7 Action diagram of the seal bar. 8 is an explanatory view of a conventional example.

[Explanation of symbols]

11. ． ． Bar-shaped guide, 12. ． ． Block 1
4. ． ． First cam, 15. ． ． First lever, 2
0. ． ． Second lever, 23. ． ． Screw rod, 2
4. ． ． Slider, 25. ． ． Pin, 33. ． ．
Film, 35. ． ． Paul, 36, 37. ． ． Seal bar, 45. ． ． Transmission shaft, 46. ． ． Bell crank, 52. ． ． Bevel gear, 55. ． ． Spline shaft, 57. ． ． Second cam, 59. ． ． Seesaw pole,
64. ． ． belt.

Claims (3)

[Claims] 1. A pair of guides 11, 11 installed in parallel on both sides of a transportation path of a packaging film 33, and a pair of blocks 12, 12 for supporting a sealer slidably supported by the both guides, and continuously rotated. Means for transmitting the swinging action of the first lever 15 which is actuated by the rotation of the cam 14 to the both blocks 12 to reciprocate the blocks 12 along the guide 11 and the two blocks 12 and 12 provided upright. A pair of upper and lower seal bars 36, 37 erected vertically on the pair of guides 35, 35, and a pair of bell cranks 46, 46 fixed to both ends of a conductive shaft 45 bearing between the blocks 12, 12. 4 links 47 and 48 connecting both ends of the block and both ends of the seal bars 36 and 37, and a bearing plate 50 formed on the block 12 are freely rotatable. A bevel gear 54 supported and meshed with a pinion 52 provided on the transmission shaft 45, a spline shaft 55 having one end fixed to the bevel gear 52, and a second cam 57 provided on the same shaft as the first cam 14. The belt 6 with which the swing end of the seesaw rod 59 swinging by the rotation of the
4 and the pulley 61 for supporting the belt, the spline shaft 55 is slidably engaged with the central hole of the pulley 61, and the spline shaft 55 is inverted by the swinging action of the seesaw rod 59. apparatus. 2. A screw rod 23 is rotatably installed along the first lever 15 in claim 1, a slider 24 is supported by the screw rod 23, and a pin 25 of the slider and a sealer supporting block are provided. Connected via a link mechanism,
A packaging material heat-sealing device in which the swing width of the pin 25 is changed by the slider 24 which is displaced by the operation of the screw rod, and the reciprocating movement amount of the block is adjusted correspondingly. 3. The method according to claim 1, wherein both ends of a bell crank 46 provided at both ends of the transmission shaft 45 and the upper and lower seal bars 36,
A packaging material heat-sealing device, characterized in that links 47, 78 connecting with 37 are curved outward to avoid collision with the transmission shaft.