JPH0657805U - Heat sealing device - Google Patents

Abstract

(57) [Summary] [Structure] Of the pair of holding portions A and B for holding the sealed portion of the package, one holding portion A is attached to both sides of the heater 3 on the holding surface 2a side. In addition to providing the electrodes 10 that detachably lock each of the terminals 11 in a penetrating state, the contact width in the thickness direction of the peripheral portion of the locking hole 12 of the terminal 11 is determined by the thickness of the heater fastening portion of the terminal 11. Is also very large. [Effect] The step generated at the fastening portion between the terminal and the heater is made small so that the sealed portion of the package can be held with a substantially constant surface pressure at any position of the heat fusion action portion of the heater. While increasing the contact area between the terminal and the electrode, it is possible not only to suppress the occurrence of sparks during energization due to poor contact, but also to increase the temperature by decreasing the current per unit contact area. Therefore, the durability of the entire device including the terminals and electrodes can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a heat-sealing device used for heat-sealing a sealed part of a package made of a heat-fusible material such as vinyl chloride film, polyethylene film, or polypropylene film. Of the pair of holding parts that can be switched between the holding state for holding the sealed part of the fusible package and the holding release state, the holding surface of one holding part is fastened to both ends of the heater. The present invention relates to a heat-sealing device provided with electrodes that detachably engage each of the formed terminals in a penetrating state.

[0002]

[Prior art]

 In the conventional heat seal device, as shown in FIG. 9, each of the terminals 51 fixed to the heater 50 has the same whole area including the heater fixing portion 51a and the peripheral portion 51b of the locking hole 52. The plate body has a thickness (for example, a brass plate having a plate thickness of 0.2 mm).

[0003]

[Problems to be solved by the device]

 In this type of heat seal device, the sandwiching surface b of the other sandwiching portion B facing the heater 50 is made slightly longer than the heat-sealing portion of the heater 50, and the effective heat-sealing of the heater 50 is performed. While maximizing the working length L, it is desirable to hold the sealed part of the package with a substantially constant surface pressure at any position of the heat-sealing part of the heater 50. Has been done. That is, since a step is formed at the fastening portion between the terminal 51 and the heater 50, when the pair of holding portions A and B are switched to the holding state, as shown in FIG. A triangular void S is generated between the other holding body B facing this. The triangular void S can be absorbed to some extent by the elastic deformation of the elastic body 53 attached to the holding surface b side of the other holding body B, but the surface pressure in the longitudinal direction of the heater varies during the holding. This is unavoidable, and the heat fusion performance deteriorates at the place where the surface pressure decreases. Therefore, it is necessary to make the thickness of the terminal 51 as thin as possible so as to minimize the step generated at the fastening portion between the terminal 51 and the heater 50. However, if the thickness of the terminal 51 is reduced, the area of the portion of the locking hole peripheral portion 51b of the terminal 51 that contacts the electrode 54 also decreases, so that the contact between the terminal 51 and the electrode 54 is reduced. There is a high possibility that a defect will occur, and if a contact defect occurs, there is a problem that a spark is generated at the time of energization and the terminals 51 and electrodes 54 are damaged. The present invention has been made in view of the above circumstances, and an object of the present invention is to reduce the step generated at the fastening portion between the terminal and the heater, while maintaining the difference between the terminal and the electrode. The point is to be able to suppress damage due to poor contact.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the heat seal device according to claim 1 of the present invention, in the structure described in the first paragraph, at least a part of the peripheral portion of the locking hole of the terminal, which is in contact with the electrode, has a thickness. The contact width in the direction is set to be larger than the thickness of the heater fastening portion of the terminal. According to a second aspect of the present invention, the entire peripheral edge of the locking hole of the terminal is formed in a cylindrical shape in the thickness direction.

[0005]

[Action]

 While reducing the thickness of the heater fastening portion of the terminal to reduce the step generated in the fastening portion of the terminal and the heater, at least a part of the electrode contact surface of the terminal is thinner than the thickness of the heater fastening portion. Since the structure is large, the contact area between the terminal and the electrode can be increased.

[0006]

[Effect of device]

 Therefore, it is possible to hold down the sealed portion of the package with a substantially constant surface pressure at any position of the heat fusion action portion of the heater by reducing the step generated at the fastening portion between the terminal and the heater. Even though it is possible to do so, not only can the generation of sparks during energization due to poor contact be suppressed by increasing the contact area between the terminal and the electrode, but the temperature per unit contact area can also be reduced by reducing the current. Since the rise can also be suppressed, the durability of the entire device including the terminals and electrodes can be improved.

Further, according to claim 2 of the present invention, in order to increase the contact area between the terminal and the electrode, the entire peripheral edge of the locking hole of the terminal is formed in a cylindrical shape in the thickness direction. By increasing the rigidity of the terminal itself, the durability can be further improved.

[0008]

【Example】

 [First Embodiment] FIGS. 1 to 5 show a tabletop heat seal device for welding a sealed portion 1a of a heat-sealable package 1 such as a polyethylene film or a polypropylene film, which is made of aluminum. A lower holding part A having a heater 3 attached thereto which heats up when energized is attached to the upper part of an alloy casing 2, and a holding posture and a holding release posture are switched by raising and lowering the casing 2 around a horizontal axis. It is composed of an upper holding part B with a crimping lever 4. Inside the casing 2 of the lower holding part A, a timer 5 using a variable resistor for setting an energization time (heating time) for the heater 3 and a timing of starting energization for the heater 3 are used to move the crimp lever 4. An electric circuit 9 for heating is provided, which includes a micro switch 6 for detection in step 1, a lamp 7 for lighting and indicating that it is in an energized state, and a transformer 8. On the upper part of the casing 2, a narrow-width ridge portion 2A protruding along the longitudinal direction of the heater 3 and a pair of flat receiving surfaces 2B located on both sides in the width direction of the ridge portion 2A. Further, the upper surface of the ridge 2A is formed as a smooth holding surface 2a for receiving and supporting the bare wire type heating wire made of nickel alloy or iron chromium alloy which constitutes the heater 3. Electrodes 10 connected to the secondary side circuit of the transformer 8 are arranged on both sides of the protrusion 2A in the longitudinal direction, and one of them is located on the swing fulcrum side of the crimping lever 4. The electrode 10 is formed into a pin shape capable of detachably engaging the terminal 11 fixed to one end of the heater 3 by spot welding in a penetrating state, and the other electrode 10 is fixed to the other end of the heater 3. It is composed of a screw capable of detachably locking the terminal 11 which is detached. Then, the entire peripheral portion 11a of the locking hole 12 of each terminal 11 is formed in a cylindrical shape in the thickness direction (burring process), and the contact width in the thickness direction of the portion in contact with the electrode 10 is The thickness of the terminal 11 is larger than that of the heater fastening portion 11b. Therefore, by increasing the contact area between the terminal 11 and the electrode 10, it is possible not only to suppress the occurrence of sparks at the time of energization due to poor contact, but also to suppress the temperature rise by decreasing the current per unit contact area. Therefore, the durability of the entire device including the terminal 11 and the electrode 10 can be improved. Further, an insulating sheet 12 such as a glass tape is attached to the holding surface 2a of the ridge 2A, and an adhesion preventing sheet 13 such as a Teflon tape having excellent heat resistance for covering the heater 3 is provided. It is provided. In the adhesion preventing sheet 13, required portions of the non-holding corresponding portion 13b except the holding corresponding portion 13a corresponding to the heater 3, that is, the left and right side portions along the longitudinal direction of the heater 3 are the protrusions. Faces of the left and right steeply inclined side faces 2b, which are non-holding faces of the portion 2A, and the presser cover 14, which is detachably mounted and fixed on the left and right flat receiving faces 2B while being fitted onto the ridge portion 2A. It is sandwiched and fixed. The crimping lever 4 of the upper holding portion B is pivotally attached to a bracket 15 provided at one longitudinal end of the casing 2 so as to be vertically swingable around a fulcrum pin 16 in a horizontal posture. The crimping lever 4 is provided with a crimping plate 17 having a substantially T-shaped cross section and protruding downward through an opening formed at a position corresponding to the holding surface 2a of the ridge 2A. 17 is attached by a screw 18 vertically moving within a range of a long hole 17a formed in the central portion of the crimping plate 17, and the crimping plate 17 is provided between the inner surface of the crimping lever 4 and the crimping plate 17. A pair of coil springs 19 for elastically urging the ridges toward the projecting side are interposed, and the dovetail groove formed in the lower end portion of the crimping plate 17 has a holding surface 2a of the ridge 2A. An elastic body 20 made of Teflon that elastically holds the sealed portion 1a of the package 1 between the two is replaceably attached. In the figure, 5a is an operation knob of the timer 5, and 21 is an electrode for elastically moving one electrode 10 located on the swinging fulcrum side of the crimping lever 4 in the heater tension direction. In order to do so, it is a conductive spring member provided so as to form a part of the heating electric circuit 9.

Second Embodiment In increasing the contact area between the terminal 11 and the electrode 10, in the first embodiment, the entire peripheral edge of the locking hole 12 of the terminal 11 is stamped out in the thickness direction into a tubular shape. Although it is formed, as shown in FIG. 6, of the peripheral portion of the locking hole 12 of the terminal 11, a semi-circumferential portion on the side in contact with the electrode 10 may be stamped and formed in a semi-cylindrical shape.

[Third Embodiment] In increasing the contact area between the terminal 11 and the electrode 10, as shown in FIG. 7, one of the peripheral portions of the locking hole 12 of the terminal 11 comes into contact with the electrode 10. Alternatively, only a part of the portion to be formed may be stamped and formed in the thickness direction. [Fourth Embodiment] In increasing the contact area between the terminal 11 and the electrode 10, as shown in FIG. 8, a half of the peripheral portion of the locking hole 12 of the terminal 11 on the side contacting the electrode 10 is used. The plate thickness of the whole part may be configured to be larger than the plate thickness of the heater fastening part of the terminal 11.

[Other Embodiments]

In each of the above-described embodiments, the heater 3 is attached to the holding surface 2a of the lower holding portion A. However, this heater 3 may be attached to the holding surface of the upper holding body B, and It may be mounted on both the holding surface 2a of the side holding portion A and the holding surface of the upper holding body B.

In each of the above-described embodiments, the holding state and the holding state are switched by the relative swinging of the holding portions A and B. However, a parallel four-link, an air cylinder or the like is used to change the holding state. The holding portions A and B may be configured to be switched between a holding state and a holding release state by relative translation.

In each of the above-described embodiments, the technique of the present invention is applied to the desk-top type heat seal device, but the technique of the present invention can also be applied to the handy type or floor installation type heat seal device.

As the package 1, any structure can be used as long as at least the sealed portion 1a is configured to be heat-sealed.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of a heater mounting portion.

FIG. 2 is an enlarged perspective view of a heater and terminals.

FIG. 3 is a vertical cross-sectional view of the entire device

FIG. 4 is an exploded cross-sectional view of a holding portion.

FIG. 5 is a cross-sectional view of the holding section.

FIG. 6 is an enlarged perspective view of a heater and terminals showing a second embodiment.

FIG. 7 is an enlarged perspective view of a heater and terminals showing a third embodiment.

FIG. 8 is an enlarged perspective view of a heater and terminals showing a fourth embodiment.

FIG. 9 is a cross-sectional view of essential parts showing a conventional heat seal device.

[Explanation of symbols]

 A Holding part B Holding part 1 Package 1a Enclosed part 2a Holding surface 3 Heater 10 Electrode 11 Terminal 12 Locking hole

Claims (2)

[Scope of utility model registration request] 1. At least one of a pair of holding portions (A, B) which can be switched between a holding state for holding a sealed portion (1a) of a heat-fusible package (1) and a holding release state. An electrode (10) is provided on the holding surface (2a) side of the holding portion (A) for removably locking each of the terminals (11) fixed to both ends of the heater (3) in a penetrating state. In the heat sealing device, the contact width in the thickness direction of at least a part of a portion of the locking hole (12) of the terminal (11) that contacts the electrode (10) is the terminal. A heat seal device configured to have a thickness larger than that of the heater fastening portion of (11). 2. The heat seal device according to claim 1, wherein the entire periphery of the locking hole (12) of the terminal (11) is formed in a cylindrical shape in the thickness direction.