JP4117298B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device for sandwiching and joining these sheets while moving at the same speed as the stacked sheets. For example, the present invention can be used as an end sealing device for pillow packaging.

As this type of sealing device, Patent Document 1 discloses a configuration as shown in FIGS.
In this structure, a driving gear (83) (83) is provided at both ends of a horizontal main shaft (82) installed between the upright plates (81) (81), and each driving gear (83) (83 ) Are engaged with driven gears (84) and (84). As shown in FIG. 8, both ends of the connecting arm (85) are rotatably coupled to the driven gear (84) (84) meshing with one of the driving gears (83) by pins (86) (86). 7, the lower seal bar (88) is placed on the lower seal base (87) installed between the connecting arms (85) (85) meshing with the pair of left and right driving gears (83) (83). ) Is fixed. The two guide rods (89) and (89) project upward from both ends of the lower seal base (87) and pass through the upper seal base (90) so as to be slidable up and down. 90) The lower end of the connecting bar (92) (92), which is rotatably connected to both ends of the pin (91) (91), is rotatable to the driving gear (83) (83) by the pins (93) (93). Are combined. The upper seal base (90) has an upper seal bar (94) (heated by a heat source (not shown)) facing the lower seal bar (88) from above in a downwardly biased state by a spring (95). It is arranged. Further, a cutter (97) is loaded in the lower seal bar (88) so as to be movable up and down, and the cutter (97) is attached to the upper ends of the lifting rods (96) and (96) pushed up by the rotary hammer (98). It is fixed.

In this case, a thermoplastic packaging sheet is placed between the upper seal bar (94) and the lower seal bar (88) in a state where the connecting arm (85) and the connecting bar (92) are in the positions indicated by the imaginary lines in FIG. (S) Send (S) in a superposed state. Then, in FIG. 8, the driving gear (83) rotates clockwise (in the direction of the arrow), and the upper seal base (90) connected to the driving gear (83) via the connecting bar (92). Descends to the position of the solid line. On the other hand, the driven gear (84) (84) meshed with the driving gear (83) rotates counterclockwise (in the direction of the arrow), and the connecting arm (85) connected to the driven gear (84) (84) is shown in FIG. It rises to the position of 8 solid line. Thus, the lower seal bar (88) and the upper seal bar (94) are pressed against each other for a predetermined time by the biasing force of the spring (95), and in the pressed state, together with the packaging sheets (S) (S) in the sheet feeding direction. Moving. The packaging sheets (S) and (S) are thermally welded while moving in this pressure contact state. Further, the welded portion is cut by the cutter (97) above the elevating rods (96) and (96) pushed up by the rotary hammer (98).
In this case, the lower seal bar (88) and the upper seal bar (94) are pressed and welded while moving in the sheet feeding direction together with the packaging sheets (S) and (S). The sheets (S) and (S) can be reliably joined.
Japanese Patent Publication No. 6-59891 Japanese Patent Publication No.43-22552

However, in the above-described conventional one, the upper and lower seal bases (90) and (87) that individually hold the upper and lower seal bars (94) and (88) are vertically slid by the guide rods (89) and (89) for maintaining the posture. It is connected freely. Therefore, only one set of the upper and lower seal bars (88) (94) can be provided for one sealing device. Further, the next welding operation cannot be performed until the lower seal bar (88) and the upper seal bar (94) separated after the completion of welding return to the initial position on the upstream side in the sheet feeding direction. For this reason, there is a problem that it is difficult to join the packaging sheets (S) and (S) at a high speed in the above-described conventional one.
The present invention has been made in view of such points.
In the “sealing device that joins the sandwiched portions of the sheets by sandwiching the sheets continuously supplied in an overlapped state with the first and second sandwiching members”, a plurality of sets for sandwiching and joining the sheets It is an object of the present invention to provide a rotary structure having a pinching member so that sheets can be joined at high speed.

The technical means of the present invention for solving the above-mentioned problems are:
"A first annular guide for guiding a plurality of first clamping members along a first closed loop having a clamping area of a predetermined length;
A second annular guide for guiding a plurality of second clamping members along a second closed loop having a clamping area of a predetermined length;
Comprising first and second attitude control means for maintaining the sheet clamping surfaces of the first and second clamping members in the clamping area in an opposing state;
The first pinching member is attached to a first rotating shaft perpendicular to a plane including an outer peripheral tangent and a radial line of the first closed loop,
The first attitude control means has one end guided along a first attitude control closed loop having a region parallel to the pinching area of the first closed loop and the other end connected to the first rotation shaft. A first attitude control lever,
The second pinching member is attached to a second rotating shaft that is perpendicular to a plane including an outer peripheral tangent and a radial line of the second closed loop,
The second posture control means has one end guided along a second posture control closed loop having a region parallel to the pinching region of the second closed loop and the other end connected to the second rotating shaft. A second attitude control lever ,
The first and second closed loops are first and second cam grooves guided by the first and second rotating shafts in an engaged state,
The first and second attitude control closed loops are first and second control cam grooves in which the tip portions of the first and second attitude control levers are separately guided in an engaged state,
The pinching area is formed in a straight line .
The technical means operates as follows.
The first and second clamping members are guided by the first and second annular guides so as to move along the first and second cam grooves which are the first and second closed loops passing through the clamping region of a predetermined length. The
Then, the overlapping portions of the sheets are pressed and joined by the first and second pressing members when passing through the pressing region.

On the other hand, at the time of the pinching joining, the sheet pinching surfaces of the first and second pinching members are maintained in an opposed state by the first and second posture control levers. That is, the rocking tip portions of the first and second attitude control levers connected to the first and second rotating shafts to which the first and second clamping members are attached are for the first and second attitude control. Of the first and second control cam grooves , which are closed loops, a region parallel to the pinching region (formed in a straight line ) of the first and second closed loops (movement trajectories of the first and second pinching members) Pass through. Accordingly, the postures of the first and second posture control levers are kept constant during the passage of the parallel regions, so that the sheets in the overlapped state are held between the sheets of the first and second pinching members. It is clamped and joined at the pressure surface.

The present invention has the following specific effects.
The postures of the first and second clamping members are controlled by first and second posture control means corresponding to these members. Therefore, as described above prior art, the upper and lower seal bars (94) (88) (the first aspect of the present invention, corresponding to a second press member.) The figure Zei維 guide rod for lifting (89) (89 ), It is not necessary to slidably connect with each other, so a plurality of first and second clamping members can be provided in one seal device (rotary structure), and the sheets can be joined at high speed. wear.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the sealing device according to the embodiment of the present invention includes a chain conveyor (70) for conveying a semi-package (T1), and a packaging sheet (S) on the front and back of the semi-package (T1). The upper and lower pressing devices (A) and (B) for pressing and joining the sheet in the feed direction at a predetermined pitch are provided. Details of each part will be described below.
As shown in FIG. 6, the semi-wrapped product (T1) is a product in which a packaged item (H) such as confectionery is contained at a predetermined pitch in a long cylindrical body obtained by rolling a packaging sheet (S). Thus, a hot melt layer is formed on the inner surface of the packaging sheet (S), so that the upper and lower packaging sheets (S) (S) can be heat-welded.

[Chain conveyor (70)]
The chain conveyor (70) for transporting the semi-wrapped product (T1) is hung on a set of four sprockets (71) (71) arranged at each vertex of the rectangle and the sprockets (71) (71). An endless chain (72) is provided. Two sets of the four sprockets 71 and 71 and an endless chain 72 attached to the four sprockets 71 and 71 are arranged at intervals in the front-rear direction with respect to the paper surface of FIG. Further, between the two endless chains (72) and (72) provided in this way, a group of connecting bars (73) and (73) for receiving the semi-wrapped product (T1) is installed, and each connecting bar The groups (73) and (73) are provided intermittently with an interval (74) slightly larger than the width of the upper seal bars (1), (1) and (1) described later.

[Upper pressing device (A)]
As shown in FIGS. 1 and 2, the upper pressing device (A) corresponds to the first pinching member of the above-mentioned invention specific matter that heats and presses the long semi-package (T1) from the front and back at a predetermined pitch. Three upper seal bars (1) (1) (1) and upper planetary shafts (13) (13) (13) corresponding to the first rotating shafts to which these are attached separately (first closed loop described above) The cam groove (110) is set to be perpendicular to the surface including the outer peripheral tangent and radius line of the cam track). Further, the upper pressing device (A) includes upper groove cams (11), (11) corresponding to the first annular guide of the above-mentioned invention specific matter for guiding the upper seal bars (1), (1), (1) along the closed loop. And an upper cam plate (12) corresponding to the above-described first posture control means for controlling the posture of the upper seal bars (1), (1) and (1). The upper planetary shafts (13), (13) and (13) are connected to the upper sun shaft (15) through rotating flanges (14) and (14). In FIG. 2, the chain conveyor (70) is omitted.

《Upper seal bar (1)》
As shown in FIG. 2, the upper seal bar (1) is fixed to the center of the upper planetary shaft (13) in the axial direction with bolts (16) (16) and nuts (17) (17). A heater (160) is embedded in (see FIGS. 2 and 5).
Further, in the upper seal bar (1), a cutter (18) for joining and cutting the upper and lower overlapping portions of the packaging sheet (S) is loaded so as to be movable up and down, and the cutter (18) As shown in FIG. 5, the upper edge is inserted and fixed in the insertion groove (190) at the lower end of the lifting shafts (19) and (19). Further, the lifting shafts (19) and (19) are springs (192 ) In the protruding direction.
《Rotating flange (14)》
As shown in FIGS. 2 and 3, bearings (130) (130) fitted and fixed near both ends of the upper planetary shaft (13) to which the upper seal bar (1) is attached have rotating flanges ( 14) It is accommodated in the engaging groove (140) (140) opened from the outer periphery to the center of (14) so as to be slidable and rotatable.

《Upper groove cam (11)》
The upper groove cams (11) and (11) are disposed adjacent to the rotating flanges (14) and (14), and the upper groove cams (11) and (11) are provided with the upper planetary shaft (13). A closed loop cam groove (110) into which the outer bearings (131) (131) are fitted is formed in the vicinity of both ends. The cam groove (110) includes a lower straight region (111) that is a pinching region of a predetermined length and an upper curved region (112) that connects both ends thereof.

《Upper cam plate (12)》
An upper cam plate (12) for controlling the posture of the upper seal bar (1) is disposed adjacent to one upper groove cam (11) of the upper groove cams (11) (11). At the same time, the upper cam plate (12) is formed with an auxiliary cam groove (120) whose center is deviated from the cam groove (110) of the upper groove cam (11). The auxiliary cam groove (120) is similar to the cam groove (110) of the upper groove cam (11), and the lower linear area (121) parallel to the lower linear area (111) of the upper groove cam (11) and both ends thereof. The upper curved area (122) connecting the two is provided.
One end of the attitude control lever (10) is rotatably coupled to the bearing (132) fitted in the auxiliary cam groove (120) by a pin (101) and is formed at the other end of the attitude control lever (10). One end (133) of the upper planetary shaft (13) is rotatably inserted into the through hole (102). The upper cam plate (12) is fixed to a first fixing plate (30) erected on a base (C) with a bolt (not shown), and an upper groove cam (11) adjacent to the upper cam plate (12). ) (See FIG. 4), the outer frame 113 (the outer member of the cam groove 110) is fixed to the first fixing plate 30 with bolts 115 and 115. An inner plate (114) (an inner member of the cam groove (110)) provided on the inner side of the outer frame (113) is fixed to the first fixing plate (30) with bolts (116) and (116). Yes.
On the other hand, the upper groove cam (11) on the right side in FIG. 2 is fixed to a second fixing plate (31) erected on the base (C) with a bolt (not shown).

《Upper sun axis (15)》
As shown in FIG. 2, the rotating flanges (14) and (14), the upper groove cams (11) and (11), and the upper cam plate (12) penetrate the vicinity of both ends of the upper sun shaft (15) and rotate. The flanges (14) and (14) are fitted to the upper sun shaft (15) in a non-rotating state. On the other hand, the upper sun shaft (15) penetrates the upper groove cams (11) (11) and the upper cam plate (12) in a rotatable manner.
As shown in FIGS. 2 and 5, a cutting cam (250) is externally fitted and fixed to the central portion in the axial direction of the upper sun shaft (15) in a non-rotating state.
As shown in FIG. 2, the vicinity of both ends of the upper sun shaft (15) is rotatably supported by bearings (26) and (26) with respect to the first fixed plate (30) and the second fixed plate (31). In addition, an upper transmission gear (27) that is rotated by a drive motor (not shown) via a timing belt (28) is fitted and fixed to one end of the upper sun shaft (15).

[Lower pressing device (B)]
The lower pressing device (B) is configured in the same manner as the upper pressing device (A) except for the structure near the lower seal bar (2). For this reason, as shown in FIG. 3, the outer tangent and radius of the three lower planetary shafts (23) which are the second rotating shafts which are the specific matters of the invention described above (the cam groove (210) which is the first closed loop already described) Bearings (230) that are fitted on the respective surfaces (set perpendicular to the plane including the line) are slidably and rotatably accommodated in the engaging grooves (240) of the rotating flange (24), and The bearing (231) is accommodated in the closed loop cam groove (210) of the lower groove cam (21). Further, the bearing (232) fixed by the pin (201) to the end of the attitude control lever (20) that is rotatably fitted to the one end (233) of the lower planetary shaft (23) is an invention specific matter. The auxiliary cam groove (220) of the lower cam plate (22) corresponding to the second attitude control means is accommodated.
However, as shown in FIG. 3, the cam groove (210) and the auxiliary cam groove (220) formed in the lower groove cam (21) and the lower cam plate (22) are the upper groove cam (11) and the upper cam plate (12 ) And the cam groove (110) and the auxiliary cam groove (120) formed in the vertical direction. That is, the cam groove (210) of the lower groove cam (21) has an upper straight region (211) and a lower curved region (212) connecting both ends thereof, and an auxiliary cam groove (220) of the lower cam plate (22). ) Also includes an upper straight region (221) and a lower curved region (222) connecting both ends thereof.

<Lower seal bar (2)>
As shown in FIG. 2, each lower seal bar (2) disposed at the center in the axial direction of the three lower planetary shafts (23), (23), and (23) has the lower planetary shaft (23) in the diametrical direction. The lower seal bar (2) is urged in the push-out direction by the compression springs (35) (35). As shown in FIGS. 2 and 5, heaters 36 and 36 are embedded in the lower seal bar 2.
The lower sun shaft (25) passes through the centers of the rotating flange (24), the lower groove cam (21), and the lower cam plate (22) in the same manner as the sun shaft (15) described above. When it is rotatably attached to the fixed plate (30) and the second fixed plate (31) by bearings (39) and (39). A lower transmission gear (37) that meshes with the upper transmission gear (27) on the upper pressing device (A) side is attached to one end of the lower sun shaft (25).

[Operation]
Next, the operation of the sealing device according to the present embodiment will be described.
When a drive motor (not shown) is operated, as shown by an imaginary line in FIG. 1, the half package (T1) is conveyed from the upstream, and the half package (T1) is moved upward by the chain conveyor (70). A) and the lower pressing device (B) are allowed to pass through.
Further, the rotational force of the drive motor is transmitted to the upper transmission gear (27) and the lower transmission gear (37) meshing with the upper transmission gear (27) via the timing belt (28) shown in FIG. The gear (37) rotates in the reverse direction. As a result, the upper sun shaft (15) and the lower sun shaft (25) rotate, and the bearings (130) are inserted into the engaging grooves (140) and (240) of the rotating flanges (14) and (24) fixedly fitted to these. ) (230) engages the upper planetary shaft (13) (13) (13) and the lower planetary shaft (23) (23) (23) of the upper solar shaft (15) and the lower solar shaft (25) Revolve around.
When the upper planetary shaft (13) revolves around the upper sun shaft (15), the bearing (131) fitted around it moves along the cam groove (110) of the upper groove cam (11), and its lower straight line In area (111), it moves linearly. When the bearing (131) passes through the lower straight region (111), the upper seal bar (1) pushes downward between the articles to be packaged (H) and (H) in the half package (T1). The bearing (132) attached to the end of the attitude control lever (10) moves linearly within the lower linear area (121) of the auxiliary cam groove (120). When the bearing (131) moves in the lower linear area (111) of the upper groove cam (11) and the bearing (132) moves in the lower linear area (121) of the upper cam plate (12), the attitude control lever ( 10) is maintained in a constant posture, whereby the sheet pressing surface (1a) on the lower surface of the upper seal bar (1) is maintained in a posture facing downward.

  On the other hand, when the lower planetary shaft (23) revolves around the lower sun shaft (25), the bearing (231) fitted on the lower planetary shaft (25) moves along the cam groove (210) of the lower groove cam (21). It moves linearly in the upper straight area (211). When the bearing (231) passes through the upper straight region (211), the lower seal bar (2) presses upward between the articles to be packaged (H) and (H) in the semi-package (T1). . Further, the bearing (232) attached to the end of the attitude control lever (20) linearly moves in the upper straight region (221) of the auxiliary cam groove (220). When the bearing (231) moves in the upper linear area (211) of the lower groove cam (21) and the bearing (232) moves in the upper linear area (221) of the lower cam plate (22), the attitude control lever ( 20) is maintained in a fixed posture, whereby the sheet pressing surface (2a) on the upper surface of the lower seal bar (2) is maintained in a posture facing upward. As a result, as shown in FIG. 1, the lower seal bar (2) and the upper seal bar (1) sandwich the half package (T1) between the articles to be packaged (H) (H), and hot the inner surface. Welded in the melt layer.

On the other hand, as shown in FIG. 5, at the time of the welding, the upper seal bar (1) passes through the lower straight region (111) of the cam groove (110) of the upper groove cam (11). approach. Therefore, the elevating shaft (19) is pushed out against the biasing force of the spring (192) by the cutting cam (250), whereby the welded portion of the semi-package (T1) is cut by the cutter (18). .
Thus, in the sealing device according to the above embodiment, the first and second clamping members (1) and (2) are the groove cams (12) as the first and second attitude control means respectively corresponding to them. The posture is controlled by (22) and the posture control levers (10) and (20). Therefore, as described above, the upper and lower seal bars (94) and (88) (corresponding to the first and second clamping members (1) and (2) of the present invention) are used as the guide rods for maintaining the posture control. (89) Since there is no need to connect with (89), multiple sets of first and second clamping members (1) and (2) can be provided in one seal device (rotary structure) Sheets can be joined at high speed.

In the above-described embodiment, the packaging sheet (S) is heat-welded with the hot melt layer on the inner surface, but cold glue or a pressure-sensitive adhesive layer is formed on the inner surface of the packaging sheet (S), and these cold glues, etc. The packaging sheet (S) may be clamped and bonded using this layer.
In the above embodiment, the case where the present invention is applied to the technique of welding the upper and lower overlapping portions of the packaging sheet (S) has been described as an example, but the overlapping portions of various sheets other than the packaging sheet are welded. The present invention can also be applied to those.
In the above embodiment, the case where three sets of the upper and lower seal bars (1) and (2) are arranged has been exemplarily described, but one set or two sets and four or more sets may be arranged. The number of structures does not matter.

FIG. 2 is a longitudinal cross-sectional view of the II line partially omitted. The longitudinal cross-sectional view of the omission of a part of the sealing device according to the embodiment of the present invention Exploded perspective view of the main parts of the upper pressing device (A) and the lower pressing device (B) Front view of upper pressing device (A) and lower pressing device (B) Illustration of sealing operation Cross section of half package (T1) Illustration of conventional example Illustration of conventional example

Explanation of symbols

(1) ... 1st clamping member
(2) ... second clamping member
(10) ... Attitude control lever
(11) ... Upper groove cam
(12) ... Upper cam plate
(13) ... Upper planetary axis
(14) ・ ・ ・ Rotating flange
(15) ・ ・ ・ Upper solar axis
(20) ... Attitude control lever
(21) ... Bottom groove cam
(22) ... Lower cam plate
(23) ... Lower planetary axis
(24) ・ ・ ・ Rotating flange
(25) ... Lower planetary axis
(S) ・ ・ ・ Packaging sheet

Claims (1)

In a sealing device that joins a nipping portion of the sheet by nipping the sheet continuously supplied in an overlapped state with first and second nipping members,
A first annular guide for guiding a plurality of first clamping members along a first closed loop having a clamping area of a predetermined length;
A second annular guide for guiding a plurality of second clamping members along a second closed loop having a clamping area of a predetermined length;
Comprising first and second attitude control means for maintaining the sheet clamping surfaces of the first and second clamping members in the clamping area in an opposing state;
The first pinching member is attached to a first rotating shaft perpendicular to a plane including an outer peripheral tangent and a radial line of the first closed loop,
The first attitude control means has one end guided along a first attitude control closed loop having a region parallel to the pinching area of the first closed loop and the other end connected to the first rotation shaft. A first attitude control lever,
The second pinching member is attached to a second rotating shaft that is perpendicular to a plane including an outer peripheral tangent and a radial line of the second closed loop,
The second posture control means has one end guided along a second posture control closed loop having a region parallel to the pinching region of the second closed loop and the other end connected to the second rotating shaft. A second attitude control lever ,
The first and second closed loops are first and second cam grooves guided by the first and second rotating shafts in an engaged state,
The first and second attitude control closed loops are first and second control cam grooves in which the tip portions of the first and second attitude control levers are separately guided in an engaged state,
The sealing device , wherein the clamping region is formed in a straight line .

Images