JP4174219B2 - Heat sealing device and medicine packaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat seal device that feeds a sheet from a paper tube formed by winding a long heat-weldable sheet to form individually partitioned packages.
[0002]
[Prior art]
A heat sealing apparatus that performs heat sealing by feeding out a sheet by a driving means such as a driving roller from a paper tube formed by winding a long heat-weldable sheet in a roll shape, and forming individually packaged packages It is used by being incorporated into various devices such as a medicine packaging device.
[0003]
In addition to the driving means and the heat sealing means, the heat sealing device includes a tension adjusting mechanism provided in a heat-weldable sheet conveyance path from the paper tube body to the heat sealing means, and a braking force for the paper tube body. And a brake mechanism to be added.
[0004]
The brake mechanism is configured to be interlocked with power ON / OFF of the driving means. That is, the brake mechanism applies a braking force to the rotation of the paper tube drum when the power of the driving means is ON, and the rotation of the paper tube drum when the power of the driving means is OFF. Thus, no braking force is applied.
[0005]
The tension adjusting mechanism includes a swingable tension bar that press-engages with a heat-weldable sheet positioned between the paper tube and the driving unit, and biases the tension bar toward the heat-weldable sheet. And an urging member.
[0006]
The conventional heat sealing apparatus includes the tension adjusting mechanism and the brake mechanism having the above-described configuration. When the power of the driving unit is turned on, the paper unit is operated in cooperation with the driving unit, the tension adjusting mechanism, and the brake mechanism. By preventing “sagging” of the heat-weldable sheet fed out from the tube body, control of the heat seal interval is facilitated and / or “wrinkles” in the package body are prevented.
[0007]
However, the conventional heat seal device has the following inconvenience because the braking force to the paper tube drum is also released when the power of the driving means is turned off.
That is, the urging member of the tension adjusting mechanism constantly urges the tension bar toward the heat-weldable sheet. Therefore, when the power of the driving means is turned off, the heat-adhesive sheet is fed out from the paper tube by the tension adjusting mechanism. When the power of the drive means is turned off, the heat-weldable sheet is naturally not conveyed, so that the heat-weldable sheet between the paper tube and the drive means “sags” by the length fed by the tension adjusting mechanism.
When the power supply of the driving means is turned on to start the packaging operation from this state, there is an inconvenience such as a defective seal or “皺” in the initial period of the packaging start due to “sagging” of the heat-weldable sheet. Occurs.
[0008]
[Problems to be solved by the invention]
The present invention has been made in view of the problems in the prior art, and effectively prevents the heat-weldable sheet between the paper tube and the driving means from “sagging” when the packaging operation is stopped. An object of the present invention is to provide a heat seal device that can perform a satisfactory packaging operation even in the initial period of the packaging start when the packaging operation is stopped from the packaging operation stop state.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a driving means for feeding out the sheet from a paper tube formed by winding a long heat-weldable sheet into a roll, and a heat-welding sheet fed by the driving means. A heat sealing device for forming a package that is individually partitioned from the heat-weldable sheet, wherein the paper tube body is supported so as not to be relatively rotatable. A drum and a rotating member that is operatively connected to the paper supply drum so as not to be rotatable relative to the paper supply drum, and that forms a rotationally coupled body together with the paper supply drum; An electric brake mechanism configured to apply / release braking force to the rotating member, and the tension of the heat-weldable sheet fed from the paper tube by the driving means are adjusted. To provide a heat sealing apparatus having a Pensions adjustment mechanism.
The tension adjusting mechanism includes a tension bar swingable about a rotation center, and the tension bar is press-engaged with the heat-weldable sheet positioned between the paper tube body and the driving unit. And a biasing member that biases the tension bar, and the tension bar heats based on the driving force of the driving means when the braking force of the brake mechanism is applied when the driving means is powered on. It is located at the operating position swung to one side around the rotation center against the urging force of the urging member by the tension of the weldable sheet, and the brake mechanism is controlled when the power of the driving means is OFF. When the power is released , the urging member is configured to be located at a non-operating position that is swung from the operating position to the other side around the rotation center by the urging force of the urging member.
Further, the heat seal device is not engaged with the rotary coupling body when the tension bar is located at the operating position, and is rotated when the tension bar is located at the non-operating position. so that a contact member and the connecting body engage to stop the rotation of the rotary coupling member is provided on the tension bar.
The heat sealing apparatus is preferably applied to a medicine packaging apparatus.
[0010]
In one mode, the rotation coupling object has a tooth part, and the contact member has a gear member which meshes with the tooth part of the rotation coupling object.
Preferably, the heat seal device may further include a drum gear provided so as not to rotate relative to the paper supply drum. In such an aspect, the rotating member is a brake gear that meshes with the drum gear.
The gear member provided on the tension bar does not mesh with the drum gear and the brake gear when the tension bar is in the operating position, and when the tension bar is in the non-operating position. And is configured to mesh with at least one of the drum gear and the brake gear.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a heat sealing apparatus according to the present invention will be described with reference to the accompanying drawings. In the present embodiment, a case where the heat sealing apparatus 1 is incorporated in the medicine packaging apparatus 100 and used will be described as an example.
FIG. 1 is a partial perspective view of the heat seal device 1 in a state of being incorporated in the medicine packaging device 100.
[0012]
The heat seal device 1 is supported by a paper feed drum 11 that supports a paper tube body 20 ′ formed by winding a long heat-weldable sheet 20 in a roll shape so that the paper tube body 20 ′ cannot be relatively rotated. A driving means (not shown) such as a driving roller for feeding out the sheet 20 from the paper tube body 20 ′, and heat sealing is performed on the sheet 20 fed out by the driving means, and individually divided packaging bodies are formed. A heat seal means 30 to be formed, and a tension adjusting mechanism 50 for adjusting the tension of the sheet 20 fed from the paper tube 20 ′ by the driving means are provided.
In addition, the code | symbols 12 and 13 in FIG. 1 are the guide bars which guide the heat welding sheet | seat 20 drawn | fed out from the said paper tube 20 ', and are provided in the heat seal apparatus 1 as needed or desired.
Moreover, the code | symbol 40 in FIG. 1 is a conveyance conveyor which conveys the heat welding sheet | seat 20 after heat sealing toward the exit of a heat sealing apparatus.
[0013]
The sheet feeding drum 11, the guide bars 12 and 13, and the tension adjusting mechanism 50 are supported by the sheet feeding unit 10 that is movable relative to the case main body 110 in the medicine packaging device 100. In the present embodiment, in addition to the paper feeding unit 10, the driving unit and the heat sealing unit 30 are also movable relative to the case body 110. In other words, in the present embodiment, the paper feeding unit 10, the driving unit, and the heat sealing unit 30 can be drawn forward from the storage position stored in the case main body 110.
[0014]
FIG. 2 is a side view of the paper feeding unit 10 viewed from the direction of arrow II in FIG.
As shown in FIG. 2, the heat sealing device 1 is further operatively connected to the paper supply drum 11 so as not to rotate relative to the paper supply drum 11, and includes a rotating member that forms a rotationally connected body together with the paper supply drum. And an electric brake mechanism 60 configured to apply / release braking force to the rotating member based on power ON / OFF of the driving means.
[0015]
In the present embodiment, the heat seal device 1 includes a drum gear 15 that is not rotatable relative to the paper feed drum 11, and a brake gear 61 as the rotating member.
In other words, in the present embodiment, the gear train constituted by the drum gear 15 and the brake gear 61 constitutes the rotary coupling body that rotates together with the paper feed drum 11.
The drum gear 15 can be directly supported by the paper feed drum 11 or can be operatively connected to the paper feed drum 11.
[0016]
FIG. 3 is a cross-sectional view taken along line III-III in FIG.
As shown in FIG. 3, in the present embodiment, the brake mechanism 60 is relatively rotatable with a first input / output member 60a and a first gap 62 with respect to the first input / output member 60a. The supported second input / output member 60b, the exciting coil 60c wound around the second input / output member 60b with the second gap 63 therebetween, and the first gap 62 and the second gap 63 are inserted. Magnetic powder 60d.
[0017]
By providing the brake mechanism 60 with such a configuration, when the exciting coil 60c is energized, the magnetic powder 60d is connected in a chain, and the first input / output member 60a and the second input / output member 60b are connected to each other. When the relative rotation is impossible and the energization to the exciting coil 60c is interrupted, the magnetic powder 60d is separated apart, and the first input / output member 60a and the second input / output member 60b are relatively rotatable.
[0018]
In the present embodiment, the first input / output shaft 60a is not rotatable, and the brake gear 61 is provided on the second input / output member 60b.
Accordingly, when the exciting coil 60c is energized, the brake gear 61 and the drum gear 15 are connected to the first input / output member 60a that is fixed so as not to rotate. Is added.
On the other hand, when the energization to the exciting coil 60c is cut off, the brake gear 61 (and the second input / output member 60b) is rotatable relative to the first input / output member 60a. The braking force is released.
[0019]
The energization / interruption of the exciting coil 60c is controlled in conjunction with the power ON / OFF of the driving means (that is, the feeding / stopping of the heat welding sheet 20 by the driving means).
With the above configuration, the brake mechanism 60 can apply / release braking force to the paper supply drum 11 based on power ON / OFF for the driving means.
[0020]
FIG. 4 shows an enlarged view of the tension adjusting mechanism 50. 4 (a) and (b) respectively show a state when power is turned OFF and the power ON of the drive means.
As shown in FIG. 4, the tension adjusting mechanism 50 includes a tension bar 51 that is swingable around the center of rotation, and the tension bar 51 is positioned between the paper tube 20 ′ and the driving means. An urging member 54 for urging the tension bar 51 is provided so as to press-engage with the heat-weldable sheet 20.
[0021]
In the present embodiment, the tension bar 51 includes a first arm 52 whose base end portion 52a is rotatably supported by the paper feed unit body, and a base end portion 53a fixedly connected to the first arm. In addition, a second arm 53 is provided that press-engages with the heat-weldable sheet 20 in a state in which the leading end 53b is guided by a guide groove 56 formed in the sheet feeding unit body. A single member is also possible.
In the present embodiment, the base end portion 52 a of the first arm constitutes the rotation center of the tension bar 51.
[0022]
Reference numeral 55a in the figure is a stopper member connected to the tension bar. The stopper member 55 a cooperates with an electromagnet 55 b provided in the paper feeding unit 10. That is, when the paper feeding unit 10 is pulled out from the case main body 110, the leading end 52b of the first arm is guided downward by a guide member (not shown), whereby the tension bar 51 is rotated around the rotation center on the other side (in FIG. 4). Swings clockwise). The stopper member 55a and the electromagnet 55b are provided to lock the tension arm 51 in such a state.
[0023]
As shown in FIG. 4A, the heat-weldable sheet 20 fed out from the paper tube extends to the drive means via the tip end portion of the tension bar 51 and the guide bars 12 and 13. In this state, the tension bar 51 is swung in a direction (in a counterclockwise direction in FIG. 4 (a)) to be pressed and engaged with the heat-weldable sheet by the urging force of the urging member 54. Yes. That is, when the power of the driving means is turned off, the tension bar 51 is positioned at the non-operating position (position shown in FIG. 4A) on the other side around the rotation axis by the urging force of the urging member 54. Yes.
[0024]
When the power of the driving unit is turned on from the power-off state of the driving unit shown in FIG. 4A, the heat-welding sheet 20 is pulled by the driving unit to the downstream side in the conveying direction. That is, in the power-on state, the driving means pulls the heat-weldable sheet 20 against the urging force of the urging member 54. As a result, the tension bar 51 is rotated about the rotation axis from the non-operating position. It is located in the side operation position (position shown in FIG. 4 (b)).
In this state, the heat-weldable sheet 20 is maintained at a desired tension under the cooperation of the driving means, the tension bar 51 (the urging member 54), and the brake mechanism 60.
[0025]
By the way, when the power of the driving means is turned off from the power-on state of the driving means shown in FIG. 4B, the driving means stops while holding the heat-welding sheet, and the brake mechanism 60 is fed. Release the braking force on the paper drum 11. At this time, the tension bar 51 remains biased to the other side around the rotation axis by the biasing member 54. Accordingly, when the driving means is shifted from the power ON state to the power OFF state, the tension bar 51 pulls the heat-welding sheet 20, and as a result, the sheet feeding drum 11 is rotated in one direction (counterclockwise in FIG. 4). The heat-weldable sheet 20 “sags” between the tension bar 51 and the paper tube 11.
If such “sag” exists, the heat-weldable sheet 20 cannot be maintained at the desired tension immediately after the power of the driving means is turned on next, resulting in inconvenience such as defective sealing. .
[0026]
In order to prevent such inconvenience, the heat sealing apparatus 1 according to the present embodiment further includes the following configuration in addition to the above configuration.
That is, when the tension bar 51 is located at the operating position, it does not engage with the rotary connecting body, and when the tension bar 51 is located at the non-operating position, it engages with the rotating connecting body. The tension bar 51 is provided with an abutting member that stops the rotation of the rotary connecting body.
In the present embodiment, as described above, the drum gear 15 and the brake gear 61 constitute the rotary coupling body, and when the tension bar 51 is located at the operating position as the contact member, A gear member 58 is provided so as to mesh with the drum gear 15 when it is not meshed with the drum gear 15 and is located at the non-operating position.
More preferably, in the present embodiment, as the gear member 58, a rack member that meshes with the drum gear 15 when the power of the driving means is turned off is used.
[0027]
Since the rotation center of the contact member (in this embodiment, the rotation center 52a of the tension bar 51) and the rotation center of the drum gear 15 are different from each other, when the two mesh with each other, the sheet feeding drum 11 Becomes unrotatable.
Further, since the abutting member is pressed toward the drum gear 15 by the urging member 54, the engagement between the abutting member and the drum gear 15 may be released unless the driving means starts operating. Absent.
[0028]
As described above, in the present embodiment, the tension bar 51 is provided with the contact member that engages with the rotary coupling body only when the power of the driving unit is turned off. Unnecessary rotation of the paper supply drum 11 is prevented. Accordingly, it is possible to effectively prevent “sagging” of the heat-weldable sheet 20 when the driving unit is shifted from the power ON state to the power OFF state.
[0029]
In the present embodiment, the contact member is provided with the gear member 58 that meshes with / disengages from the drum gear 15, but the present invention is not limited to such a form. That is, as long as the contact member is engaged with any one of the rotary coupling bodies (for example, a gear such as the brake gear 61) so as to stop the rotation of the rotary coupling body in the power-off state of the driving means, Various forms are included.
[0030]
【The invention's effect】
As described above, according to the heat sealing apparatus according to the present invention, when the packaging operation is stopped, the thermal welding sheet between the paper tube and the driving unit is effectively prevented from sagging, and the packaging is performed. A good packaging operation can be performed even in the initial period of the packaging start when the operation is shifted from the operation stop state to the packaging operation start state.
[Brief description of the drawings]
FIG. 1 is a perspective view of a medicine packaging device in which a heat seal device according to an embodiment of the present invention is incorporated.
FIG. 2 is an arrow view taken along the arrow II in FIG. 1;
FIG. 3 is a cross-sectional view taken along line III-III in FIG.
4 is an enlarged view of a tension adjusting mechanism in the heat sealing apparatus shown in FIG. 1. FIG.
FIG. 4A shows a state when the power of the driving means is turned off (when the packaging operation is stopped ).
FIG. 4 (b) shows the state when the power ON of the drive means (during packing operations).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Heat seal apparatus 11 Paper supply drum 15 Drum gear 20 Heat-weldable sheet 20 'Paper tube body 30 Heat seal means 50 Tension adjustment mechanism 51 Tension bar 54 Energizing member 58 Contact member (gear member)
60 Brake Mechanism 61 Brake Gear 100 Drug Packaging Device

Claims (4)

Drive means for feeding out the sheet from a paper tube formed by winding a long heat-weldable sheet into a roll, and heat seal means for heat-sealing the heat-weldable sheet drawn out by the drive means A heat seal device for forming individually packaged bodies from the heat-weldable sheet,
A paper feed drum that supports the paper tube body in a relatively non-rotatable manner;
A rotating member that is operatively connected to the paper supply drum so as not to rotate relative to the paper supply drum and that forms a rotationally connected body together with the paper supply drum. An electric brake mechanism configured to add / release braking force with respect to
A tension adjusting mechanism that adjusts the tension of the heat-weldable sheet fed from the paper tube by the driving means;
The tension adjusting mechanism includes a tension bar swingable about a rotation center, and the tension bar is press-engaged with the heat-weldable sheet positioned between the paper tube body and the driving unit. A biasing member that biases the tension bar;
The tension bar resists the urging force of the urging member by the tension of the heat-weldable sheet based on the driving force of the driving means when the braking force of the brake mechanism is applied when the power of the driving means is turned on. When the braking force of the brake mechanism is released when the power of the driving means is OFF , the operation is performed by the urging force of the urging member. It is configured to be located at a non-operating position swung from the position to the other side around the rotation center,
Furthermore, when the tension bar is positioned at the operating position, the not combined rotary coupling member and engaged, and, when the tension bar is positioned at the inoperative position, the engagement with the rotating coupling member so that a contact member stops the rotation of the rotary connecting member Te is, heat-sealing apparatus characterized in that provided on the tension bar. The rotary coupling body has a tooth portion;
The heat sealing apparatus according to claim 1, wherein the contact member includes a gear member that meshes with a tooth portion of the rotary coupling body. A drum gear provided so as not to rotate relative to the paper feed drum;
The rotating member has a brake gear that meshes with the drum gear,
The gear member provided on the tension bar does not mesh with the drum gear and the brake gear when the tension bar is in the operating position, and when the tension bar is in the non-operating position. The heat seal device according to claim 2, wherein the heat seal device is configured to mesh with at least one of the drum gear and the brake gear. A medicine packaging device comprising the heat sealing device according to any one of claims 1 to 3.

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