JPH08164923A - Sealing device for packaging machine - Google Patents

Abstract

PURPOSE: To provide a sealing device for packaging machine, which can seal at a high speed, and at the same time can perform a strong sealing. CONSTITUTION: A pair of top and bottom links to be rotated are provided on the top and bottom of front and rear both sides along a feeding path of an article 1. At the same time, top and bottom supporting elements 24, 25 are supported by the top and bottom links. Then, an upper die 10 and lower die 11 are vertically movably provided on the top and bottom supporting elements 24, 25 with shafts 28, 29, and the shafts 28, 29 are engaged with a cam for horizontal guide. Then, on the opposite side of the cam for horizontal guide, a pressure cam and pressure spring which increase a sealer pressure are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device in a packaging machine, and more particularly to a sealing device for constantly holding the sealer vertically by a mechanism for moving the sealer in a straight line in a meshed state for a certain section.

[0002]

2. Description of the Related Art Heretofore, as a device of this kind, the applicant has disclosed in Japanese Patent Laid-Open No.
-170230 was proposed. This is a mechanism that guides the sealer by eight D-shaped cams and moves the sealer in a parallel straight line in a meshed state for a certain section so that the sealer is always held vertically.

[0003]

However, the D-type cam is expensive and its mechanism is complicated. The present invention obtains a strong seal by pressurizing a seal device that constantly holds the sealer vertically by a mechanism that moves the sealer in a parallel straight line in a meshed state for a certain section.

[0004]

According to the present invention, a pair of upper and lower links are provided on the upper and lower sides of the front and rear along the feeding path of the article 1 so as to rotate, and the upper and lower supports 24 are provided on the upper and lower links. , 25, and these upper and lower supports 24,
The upper die 10 and the lower die 11 are provided on the shaft 25 so as to be moved up and down by shafts 28 and 29. These shafts 28 and 29 are engaged with the cams 42, 42, 62 and 62 for horizontal guide, The seal device in the packaging machine is provided with a pressure cam 43 and a pressure spring 44 for increasing the sealer pressure on the side opposite to the cam 42.

[0005]

When the upper mold 10 and the lower mold 11 contact the film 5,
The shafts 28, 29 are cams 42, 42, 62, 6 for horizontal guidance.
2, the upper die 10 and the lower die 11 are horizontally fed in a linear trajectory while holding the film 5 therebetween. At this time, the pressure cam 43 presses the shafts 28 and 29 to increase the sealer pressure.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, articles 1, 1, ... Are sent forward on a supply conveyor 2 by dogs 3, 3 ... at regular intervals, that is, rightward in FIG. The film 5 is rolled into a film 5, and both ends of the film 5 are sandwiched between the fin sealers 7 and 7 to be continuously sealed. Upper mold for bottom seal 1
0, the seal is cut by the lower mold 11, and the discharge conveyor 1
2 is sent out. Reference numeral 13 is a heater for the upper mold 10 and lower mold 11, and 14 is a comb conveyor for feeding the article 1 at the upper mold 10 and lower mold 11.

As shown in FIGS. 2 and 3, a pair of upper links 20, 20; 21, 21 and a lower link 22 are formed on the front and rear sides of the upper mold 10 and the lower mold 11 along the feeding path of the article 1. , 2
2; 23, 23 are provided to be rotated by the motor 19, and the front and rear ends of the upper and lower supports 24, 25 are supported at the end portions of these links 20, 21, 22, 23 for rotation. The shafts 2 are attached to the central tubes 26 and 27 of the supports 24 and 25 of
8 and 29 are fitted to move up and down, and these shafts 28 and 29 are
The upper die 10 and the lower die 11 are fixed to the lower end and the upper end, respectively.
Stopper nuts 30 and 31 for adjusting the amount of deflection are screwed onto the shafts 28 and 29.

As shown in FIGS. 4, 5 (a) and (b), the upper mold 10
The pins 32, 32 planted on both sides of the support 24 are loosely fitted in the vertical grooves 33, 33 extending downward from the support 24 and the support 24
Adjusting screws 34, 34 provided on both sides of the upper mold 10 and the recess 3 of the upper mold 10
Compression springs 36, 36 are inserted between the parts 5, 35.
As shown in FIGS. 2 and 3, the pressure bar 40 fixed to the upper end of the shaft 28 extends to both sides, and the cam followers 41, 41 made of bearings fixed to both ends of the pressure bar 40 are fixed to the side. It engages with the upper surfaces of the horizontal guide cams 42, 42.

Pressure cams 43, 43 are provided above the cam followers 41, 41. As shown in FIGS. 6 and 7, the pressure cams 43, 43 are supported by a hanging frame 45 and springs 44, 44. Repress downward. A cam 43 is attached to the side opposite to the horizontal guide cam 42 that translates the sealer in parallel, and pressure is applied by a pressure spring 44. In the figure, 47 is a height adjusting screw, and 46 is an adjusting screw of the pressurizing spring 44. As shown in FIGS. 4 and 5, a cylinder 52 is fixed to the pressure bar 40 via a pair of legs 50, 50 and a plate 51, and a piston 53 of the cylinder 52 has a frame 54 and a pair of downwardly extending knives. It is fixed to both ends of a knife 56 provided to move up and down in the upper die 10 via guide pins 55, 55. Lower mold 1 as shown in FIG.
1 is provided with a groove 57 for receiving the knife 56.

As shown in FIG. 8, the lower mold 11 is substantially vertically symmetrical to the upper mold 10, and the corresponding parts are indicated by adding '. As shown in FIG. 2, the cam follower 61, which is symmetrical to the cam follower 41, engages with a horizontal guiding cam 62, which is symmetrical with the cam 42, and is supported by a fixed pressure receiving cam 63, which is symmetrical with the pressure cam 43. The receiving cam 63 is fixed, and the pressure cam 43 can be slid up and down by an adjusting screw 47 to adjust the height. Therefore, the space between the pressure cam 43 and the pressure receiving cam 63 is set to the cam follower 41 of the pressure bar 40 and the shaft 2.
Since it is determined by the dimensions of 8, 29, the upper mold 10 and the lower mold 11 of the sealer, the sealing pressure by the pressure spring 44 can be adjusted by adjusting the height of the pressure cam 43.

Next, the operation of this device will be described. The pair of upper links 20 and 21 are rotated counterclockwise in FIG. 2 by the drive motor 19, and the pair of lower links 22 and 23 are rotated clockwise in synchronization with each other. 24 and 25, shafts 28 and 29 supported by the central tubes 26 and 27, and upper and lower molds 10 and 11 also rotate in the same direction as the upper and lower links 20, 21, 22, and 23, respectively. Upper mold 1
In a state before 0 and the lower mold 11 are in contact with each other, the upper mold 10 is projected downward by the elastic force of the springs 36, 36, and the lower mold 11 is projected upward by the corresponding springs 36 ', 36' (see FIG. 8) to provide a stopper. The nuts 30 and 31 are in contact with the cylinders 26 and 27, respectively, and the upper mold 10 and the lower mold 11 are always in a vertical state and move in parallel along a circular locus.

Thus, as shown in FIG. 1, the upper die 10 and the lower die 1
When 1 is contacted between the intersubstituting conveyors 14 at a position between the articles 1 and 1 of the film 5 rolled into a tubular shape, the cam follower 41 contacts the cam 42 as shown in FIG.
Through the shaft 28, the upper die 10 is actuated relatively upward against the elastic force of the spring 36, and similarly, the cam follower 6 is actuated.
1 is in contact with the cam 62, and the lower die 11 is in contact with the elastic force of the spring 36 ′ and is operated relatively downward, so that the upper die 10 and the lower die 1
1 is sent horizontally along a straight line with the film 5 held between them.

When the cam followers 41 on both sides of the pressure bar 40 hit the surface of the cam 42, the spring 36 causes the upper die 10 protruding by the amount of deflection to move linearly along the cam surface. That is, the links 20, 21, 22, 23
The sealer is linearly moved by bending a part of the circular movement of the cam 42, 62 by the cams 42 and 62. Also, the length of linear movement can be changed by changing the amount of this deflection. At this time, the drive motor 19 moves unequally so that the upper die 10 and the lower die 11 are fed at the same speed as the film 5. At this time, since two pairs of rotary links are used to drive the sealer such as the upper mold 10 and the lower mold 11, high-speed sealing can be achieved. It can be easily removed and the length of the package to be packaged can be shortened.

On the other hand, at this time, the pressurizing cams 43, 43 are driven by the elastic force of the springs 44, 44 to cause the cam followers 41, 41 to move.
Is pressed downwards, and this force presses the upper die 10 downward via the pressure bar 40 and the shaft 28 to give a welding pressure to the film 5, while this welding pressure is applied to the lower die 11, the shaft 29, and the cam follower 61. , 61 via the pressure receiving cam 63. Thus, when the film 5 is welded, the piston 53 of the cylinder 52 shown in FIG. 4 operates downward, and the knife 56 operates downward through the frame 54 and the knife guide pins 55, 55 to cut the welded film 5. , The individual articles 1, 1 ... Wrapped in the film 5 are separated, and the articles 1, 1, ... Are separated and sent to the discharge conveyor 12. After this, the upper mold 10
And the lower mold 11 are separated into an upper part and a lower part, respectively, and are projected by springs 36 and 36 ', respectively, and move in a circular locus.

[0015]

As described above, in the present invention, the sealer is 2
Since it rotates with a pair of links, high-speed sealing can be performed, and strong pressing can be performed by the pressure cam and the pressure spring, so that a strong seal can be achieved.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part thereof.

FIG. 3 is an end view of the same.

FIG. 4 is an enlarged vertical sectional end view of the upper mold portion.

5A is a side view thereof, and FIG. 5B is a perspective view of a part thereof.

FIG. 6 is an enlarged side view of the upper horizontal guide cam.

FIG. 7 is a vertical sectional view thereof.

FIG. 8 is an enlarged vertical sectional end view of a part of the upper die and the lower die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Article 10 Upper mold 11 Lower mold 24,25 Upper and lower supports 28,29 Shafts 42, 42, 62, 62 Horizontal guide cams 43 Pressure cams 44 Pressure springs 63 Pressure receiving cams

Claims (1)

[Claims] 1. A pair of upper and lower links are provided on the upper and lower sides of the front and rear sides along an article feeding path so as to rotate, and upper and lower supports are supported by the upper and lower links, and these upper and lower supports are supported by the upper and lower supports. Is provided to move the upper mold and the lower mold up and down by the shaft,
A sealing device in a packaging machine, in which these shafts are engaged with a horizontal guide cam, and a pressure cam and a pressure spring for increasing the sealer pressure are provided on the opposite side of the horizontal guide cam.