JP7153907B2 - HINGE DEVICE FOR WORK TABLE OF PACKING MACHINE AND PACKING MACHINE INCLUDING HINGE DEVICE - Google Patents

Description

In a packing machine, the present invention provides a hinge device that enables a work table on which an object to be packed is placed to be openable and detachable on the upper surface of the packing machine body, and a hinge device that is installed via the hinge device. It relates to a packing machine with a working table.

As a conventional packing machine, a tape-shaped band is automatically (or manually) wrapped around the object to be packed, and then automatically grips the band tip and tightens the band, the band tip side and the band supply side. There is a fully-automatic (or semi-automatic) packing machine that overlaps and welds the band overlapping part, cuts the band supply end side, and packs the object to be packed.

As an example, as shown in FIG. 14, a conventional packing machine 80 includes a box-shaped packing machine main body 82 having an open top and a plurality of pressing members for gripping (clamping) appropriate portions of the band, and A heater that welds the overlapped portion of the band and the band supply side, a cutter that cuts the supply end side of the band, a cam shaft equipped with a plurality of cams that enable these members to advance and retreat or move up and down, and the cam A sealing device 84 comprising at least a motor that rotates a shaft, a drive motor capable of forward and reverse rotation that feeds out the band from the band reel 88 and pulls back the band when the band is tightened, and a drive motor that presses against the drive motor to clamp the band. A band supply device 85 having at least a touch roller to touch, a control device 86 having a CPU (central control unit) for controlling the operation of the sealing device and the band supply device, etc. are accommodated, and the upper surface of the main body 82 is It is covered with work tables 89a and 89b (Patent Document 1).

Therefore, when trouble occurs in the packing machine 80 or when periodic maintenance is performed, the work tables 89a and 89b are used to repair or maintain the sealing device 84, the band supply device 85, and the control device 86 in the main body 82. must be released.

In response to this, a semi-automatic packing machine with a work table that can be opened and closed has been invented (Patent Document 2).

As shown in FIGS. 15 and 16, the packing machine 90 disclosed in Patent Document 2 has a box-shaped main body (frame) 91 housing a band welding/tightening mechanism 94, a band reel 95, and the like. A work table 92 is attached by a support shaft 93 so as to be openable and closable.

Then, as shown in FIG. 16, the operator 96 can open the work table 92 by rotating it with the support shaft 93, and can perform maintenance, repair, etc. of the equipment accommodated in the main body 91 from above. is.

JP-A-2003-170906 Japanese Utility Model Laid-Open No. 2-129004

However, regarding the packaging machine 90 disclosed in Patent Document 2, as shown in FIG. 16, a worker 96 maintains and repairs the work table 92, which is open upward, while looking into the work table 92 while being careful not to hit the head. The long hours of work were cumbersome and stressful.

Also, when the work table 92 is removed from the main body 91 for detailed maintenance, repair, etc., the work table 92 does not become an obstacle and the worker 96 can take a comfortable posture. There is a problem that the work of removing the work table 92 and the work of reattaching the work table 92 to the main body 91 are troublesome.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a hinge device 10 for a work table of a packing machine which allows the work table of the packing machine to be freely opened and closed and which facilitates attachment and detachment of the work table.

The hinge device 10 of the work table of the packing machine of the present invention is a plate-shaped work table that covers at least a part of the upper opening of the box-shaped packing machine main body 2, for example, about half in the width direction in the longitudinal direction of the opening. A pair of hinge shafts (pins) 22a and 22b protruding to the left and right provided at one end of the table 20 and provided at the edge of the top opening of the packing machine main body 2 to support the pair of hinge shafts 22a and 22b. A hinge device 10 for a work table of a packaging machine comprising a pair of bearings 40a and 40b facing each other,
The bearings 40a and 40b are composed of an opening 41 that opens upward to enable the insertion of the hinge shafts 22a and 22b, and a first longitudinal groove extending vertically downward continuously from the opening 41. 42, a horizontal groove 43 continuously extending horizontally from the lower end of the first vertical groove 42, and a second vertical groove 44 continuously extending vertically downward from the tip of the horizontal groove 43. and an engaging portion 45 at the lower end of the second longitudinal groove 44 for rotatably engaging the hinge shafts 22a and 22b,
The pair of hinge shafts 22a and 22b are detachably inserted into the pair of bearing portions 40a and 40b (claim 1).

The bearings 40a and 40b have an opening 41 that opens upward to enable the insertion of the hinge shafts 22a and 22b, a longitudinal groove 47 that extends vertically downward continuously from the opening 41, A horizontal groove 48 extending obliquely downward from the horizontal direction continuously from the lower end of the vertical groove 47, and an engaging portion 45 at the tip of the horizontal groove 48 for rotatably engaging the hinge shafts 22a and 22b. (Claim 2).

Further, a groove may be formed with a wide width at the engaging portion 45 of the bearing portion 40 (40a, 40b) (Claim 3).

A rod-shaped support member 21 may be attached to one side end of the work table 20, and the pair of hinge shafts 22a and 22b may be attached to both longitudinal end surfaces of the support member 21 (claim 4).

In addition, it is preferable that the support member 21 has a fan-shaped cross section (claim 5).

Further, the bearing portions 40a and 40b may be formed by a pair of facing corner blocks 30a and 30b provided at the edges of the top opening of the packing machine body 2 (Claim 6).

Further, the corner blocks 30 (30a, 30b ) are provided with fan-shaped faces 31, 32 consisting of symmetric quarter-circular faces formed by raising two adjacent sides of the rectangular face 33, and the fan-shaped faces 31 , 32 The bearing portions 40 (40a, 40b) are formed on one side, and the symmetrical curved surfaces 34, 34 extend from the apexes of the fan-shaped surfaces 31, 32 to the sides other than the two adjacent sides of the rectangular surface 33. (Claim 7) .

In the fan-shaped surface 31 on which the bearing portions 40 (40a, 40b) are formed, recessed recessed portions 35 are formed around the bearing portions 40 (40a, 40b) so that the thickness is not reduced. The lightening portions 35 may be formed at a plurality of locations so that the portions 36 radially extend from the periphery of the locking portion 45 toward the outer peripheral edge of the fan-shaped surface 31 (claim 8).

Moreover, the packing machine 1 of the present invention is characterized by having a work table 20 attached to the upper surface of the packing machine main body 2 via the hinge device 10 of the present invention (Claim 9).

Moreover, the packing machine 1 of the present invention may have a pair of work tables 20a and 20b which are attached to the left and right sides of the main body via the hinge device 10 on the upper surface of the packing machine main body 2 and open and close in a double-door manner. Preferred (claim 10).

The work table 20 attached to the packing machine body 2 via the hinge device 10 for the work table of the packing machine of the present invention can be opened and closed at the top of the packing machine body 2, and the packing machine body can be opened and closed by a very simple operation. 2 and removed from the packing machine main body 2.

Further, by constructing the bearing portion 40 of the hinge device 10 from the vertical groove 47 and the lateral groove 48 (claim 2), the hinge device 10 having the second vertical groove 44 (claim 1) can be The hinge shaft 22 held in the engaging portion 45 of the bearing portion 40 does not move up and down.

Further, by forming the groove of the engaging portion 45 to be wide, the hinge shaft 22 can be rotatably supported with play.

The figure which shows the whole packing machine 1 of 1st embodiment of this invention. The figure which shows the state which the work table 20a, 20b of the packing machine 1 of FIG. 1 opened. The figure which shows the state from which work tables 20a and 20b of the packing machine 1 of FIG. 1 were removed. (a) is a figure which shows the work table 20 to which the support member 21 of the packing machine 1 of FIG. 1 was attached, (b) is a side view of (a), (C) is an overall view of the support member 21. FIG. The general view of the corner block 30 (a, d) of the packing machine 1 of FIG. The front view of the corner block 30 (a, d) of FIG. The figure which shows the modification of the corner block 30 (a, d) of FIG. The general view of the corner block 30 (a, d) of 2nd embodiment of this invention. The general view of the corner block 30 (a, d) of 2nd embodiment of this invention. The front view of the corner block 30 (a, d) of 2nd embodiment of this invention. The figure which shows the modification of the corner block 30 (a, d) of FIG. The figure which shows the modification of the corner block 30 (a, d) of 2nd embodiment of this invention. The figure which shows an example of the work table 20 to which the short support member 21 was attached. The general view of the conventional packing machine 80. FIG. The general view of the conventional packing machine 90. FIG. The figure which shows the state which opened the work table 92 of the packing machine 90 of FIG.

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 are diagrams showing a packing machine 1 provided with a hinge device 10 for a work table of the packing machine according to the first embodiment of the present invention. FIG. Fig. 2 is an overall view of the packing machine 1 with the two work tables 20a and 20b opened, and Fig. 3 is a view with the two work tables 20a and 20b open. 1 is an overall view of the packing machine 1 in a folded state; FIG.

The packing machine 1 of this embodiment is a semi-automatic packing machine, and as shown in FIGS. Equipped with caster frames (pillars with casters attached to the lower end surface) 3a, 3b, 3c, and 3d for supporting the main body 2, and two (a pair of) flat rectangular plates covering the upper opening of the packing machine main body 2. Work tables 20a and 20b are attached to the left and right sides of the packing machine main body 2 via hinge devices 10 of the present invention, which will be described later.

Further, as shown in FIG. 2, inside the packing machine main body 2, there are provided a band supply device 5 for feeding a band from a band reel 8 installed below the packing machine main body 2 and for tightening the band, a band A sealing device 4 that grips an appropriate portion of the band and cuts the band supply end side after welding the band overlapping part, and a control device 6 that controls the operation of the sealing device 4 and the band feeding device 5, etc. are accommodated. there is

The basic structure of the sealing device 4, the band supply device 5 and the control device 6 housed in the main body 2 is almost the same as the conventional one. It has at least a forward and reverse rotatable drive motor for sending out the band from the band reel 8 and for pulling back the band, and a touch roller for nipping the band by pressing against the drive motor.

The sealing device 4 includes a plurality of pressing members for gripping (holding) appropriate portions of the band, a heater for welding the overlapped portion of the band where the front end side of the band and the supply side of the band are overlapped, and a supply end side of the band. It comprises at least a cutter for cutting, a cam shaft on which a plurality of cams are mounted to move these members forward and backward or move them up and down, and a motor for rotating the cam shaft.

Further, the control device 6 has a CPU (central control device) for controlling the operations of the sealing device 4 and the band supply device 5 .

Further, as shown in FIG. 3, an operation panel 7 connected to the control device 6 is arranged on the side surface of the main body 2, and the sealing device 4 and the band supply device 5 are operated by the switches and dials of the operation panel 7. can be operated.

Next, the hinge device 10 used in the packing machine 1 of this embodiment will be described.

First, as shown in FIG. 3, rod-shaped support members 21a and 21b are attached to the two work tables 20a and 20b of this embodiment at one end in the longitudinal direction of each work table 20a and 20b. .

FIGS. 4(a) to 4(c) are diagrams showing the support member 21 of this embodiment and the work table 20 to which the support member 21 is attached. The longitudinal length of the support member 21 is the same as that of the table 20, and a pair of pins (hinge shafts) 22a and 22b are attached to both longitudinal end faces of the support member 21. As shown in FIG. In this embodiment, the pair of pins 22a and 22b are attached to the support member 21 as separate members, but the pair of pins 22a and 22b may be integrally protruding from the support member 21. FIG.

Moreover, since the support members 21a and 21b have a fan-shaped cross section (four semicircles), as shown in FIG. The work table 20 can be opened smoothly.

In this embodiment, as shown in FIG. 4(b), the support member 21 and the work table 20 are screwed together with screws 23. It is not limited to this.

In the present invention, instead of using the support member 21, pins 22a and 22b projecting to the left and right may be provided or attached to one end of the work table 20. FIG.

Next, as shown in FIG. 3, the packing machine 1 of the present embodiment has bearings for supporting the pins (hinge shafts) 22 in which the pins 22 are inserted in the four corners of the upper opening edge of the packing machine main body 2. Corner blocks 30a, 30b, 30c, 30d are provided, in which portions 40a, 40b, 40c, 40d are formed.

FIG. 5 shows an overall view of the corner block 30 of the present embodiment. The corner block 30 of the present embodiment is roughly divided into 8 equal parts of a sphere, and has three fan shapes (four semicircular ) has a rectangular shape, and as shown in FIG. A bearing portion 40 is formed on one of the two fan-shaped surfaces 31 and 32 .

As shown in FIGS. 5 and 6, the bearing portion 40 formed on the fan-shaped surface 31 is an opening that opens upward at the upper end of the fan-shaped surface 31 on the side of the rectangular surface 33 so that the pin 22 can be inserted. 41, a first vertical groove 42 extending vertically downward continuously from the opening 41, and a horizontal direction extending continuously from the lower end of the first vertical groove 42 and away from the rectangular surface 33. a second vertical groove 44 extending vertically downward continuously from the tip of the horizontal groove 43; and the second vertical groove rotatably locking the pin 22. 44 and a locking portion 45 at the lower end of the bearing portion 40. The shape of the groove of the bearing portion 40 is crank-shaped.

In this embodiment, the width of the groove of the bearing portion 40 is slightly larger than the diameter of the pin 22 so that the pin can pass therethrough, and the depth of the groove is substantially the same as the height of the pin.

As shown in FIG. 6, in this embodiment, the bearing 40 formed in the corner block 30 is provided with the opening 41 at the upper end of the sector surface 31 on the side of the rectangular surface 33, and the rectangular surface For example, as shown in FIG. 7, the opening is formed at the upper end of the corner block 30 away from the rectangular surface 33 (substantially the middle point on the arc of the fan-shaped surface 31). A portion 41 is provided, and a first vertical groove 42 extending vertically downward from the opening 41 and a horizontal direction extending continuously from the lower end of the vertical groove 42 so as to approach the rectangular surface 33 The lateral groove 43, the second longitudinal groove 44 continuously extending vertically downward from the tip of the lateral groove 43, and the lower end of the second longitudinal groove 44 for rotatably locking the pin 22. A crank-shaped groove including the engaging portion 45 may be used.

In this embodiment, two sets of a pair of corner blocks 30 are prepared so that the fan-shaped surface 31 formed with the crank-shaped groove of the bearing portion 40 is plane-symmetrical. 30a, 30b, 30c, and 30d are detachably attached to the upper ends of the caster frames 3a, 3b, 3c, and 3d or the side surfaces of the packing machine main body 2 so that the fan-shaped surfaces 31 having the bearing portions 40 face each other. .

In this embodiment, the upper ends of the corner blocks 30a, 30b, 30c, and 30d attached to the caster frames 3a, 3b, 3c, and 3d and the upper ends of the main bodies are positioned at approximately the same height. The shape of the fan-shaped surface 31 substantially matches the shape of the fan-shaped cross section of the adjacent support member 21 .

The packing machine of the work table 20 through the hinge device 10, which is composed of the pair of pins (hinge shafts) 22a, 22b and the pair of bearings 40a, 40b that pivotally support the pair of pins 22a, 22b. For attachment to the main body 2, the pins 22a and 22b are inserted through the openings 41 of the corner blocks 30a and 30b, and the pins 22a and 22b are engaged with the lower ends of the second vertical grooves 44 of the corner blocks 30. Sliding to the part 45 completes.

The pins 22 of the work tables 20a and 20b attached to the packing machine main body 2 are retained on the locking portions 45 of the bearings 40 by their own weight. This is done by rotating the stopping portion 45 .

To remove the work tables 20a and 20b, each pin 22 can be slid from the engaging portion 45 of the bearing portion 40 to the opening portion 41 and removed from the opening portion 41. As shown in FIG.

The work table 20 of this embodiment, which is attached to the packing machine main body 2 via the hinge device 10 composed of the above-described bearing portion 40 and the pin (hinge shaft) 22, can be opened and closed at the top of the main body 2. In addition, it can be attached to and removed from the packing machine main body 2 by extremely simple work.

Next, a second embodiment of the invention will be described.

The second embodiment has the same configuration as the first embodiment except that the shape of the groove of the bearing portion 40 of the hinge device 10 is different from that of the above-described first embodiment, so the description of the same configuration will be omitted. .

8 to 10 show the corner block 30 of this embodiment. Referring to FIGS. 8 to 10, the bearing part 40 of this embodiment is formed on the fan-shaped surface 31 of the corner block 30, An opening 41 opened upward to enable the pin 22 to be inserted into the upper end of the sectoral surface 31 on the side of the rectangular surface 33; A lateral groove 48 continuously extending from the lower end of the longitudinal groove 47 and inclined downward while moving away from the rectangular surface 33, and the lateral groove 48 for rotatably locking the pin (hinge shaft) 22. The groove of the bearing portion 40 is substantially L-shaped with an obtuse angle between the longitudinal groove 47 and the lateral groove 48. As shown in FIG.

The width of the groove is formed slightly larger than the diameter of the pin 22 so that the pin 22 can pass therethrough, and the depth of the groove is formed substantially equal to the height of the pin 22 .

Further, as shown in FIG. 10, since the groove of the engaging portion 45 is formed wide, the pin can be rotatably supported with play.

Further, as shown in FIG. 10, the bearing portion 40 of this embodiment has an opening 41 at the upper end of the sectoral surface 31 on the side of the rectangular surface 33, and a lateral groove 48 is formed away from the rectangular surface 33. , for example, as shown in FIG. , the lateral groove 48 communicating with the lower end of the longitudinal groove 47 and inclined downward toward the rectangular surface 33, and a locking portion 45 at the tip of the lateral groove 48 for rotatably locking the hinge shafts 22a and 22b. The bearing portion 40 may be formed of a substantially L-shaped groove in which the longitudinal groove 47 and the lateral groove 48 form an obtuse angle.

Then, as in the first embodiment, two sets of a pair of corner blocks 30 are prepared so that the fan-shaped surface 31 in which the substantially L-shaped groove of the bearing portion 40 is formed is symmetrical with each other. For each pair of corner blocks 30a, 30b, 30c, 30d, the upper end of each caster frame 3a, 3b, 3c, 3d or the side surface of the packing machine main body 2 so that the fan-shaped surface 31 having the bearing part 40 faces each other Attached detachably.

The packing machine of the work table 20 through the hinge device 10, which is composed of the pair of pins (hinge shafts) 22a, 22b and the pair of bearings 40a, 40b that pivotally support the pair of pins 22a, 22b. The attachment to the main body 2 is completed by inserting the pins 22a and 22b through the openings 41 of the corner blocks 30a and 30b and sliding them to the locking portions 45 at the ends of the lateral grooves 48 of the corner blocks 30a and 30b. do.

The pins 22 of the work tables 20a and 20b attached to the packing machine main body 2 are retained in the locking portions 45 of the bearings 40 by their own weight. This is done by rotating the part 45 .

To remove the work tables 22a and 22b, each pin 22 can be slid from the engaging portion 45 of the bearing portion 40 to the opening portion 41 and removed from the opening portion 41. As shown in FIG.

The work table 20 of this embodiment, which is attached to the packing machine main body 2 via the hinge device 10 composed of the above-described bearing portion 40 and the pin (hinge shaft) 22, can be opened and closed at the top of the packing machine main body 2. Moreover, it can be attached to and removed from the packing machine main body 2 by extremely simple work.

In addition, in the case of the hinge device 10 of the second embodiment described above, even if the packing machine 1 is lifted up by gripping the attached work tables 20a and 20b in a normal state or when the hinge device 10 of the first embodiment Therefore, the pin 22 does not move up and down significantly within the groove of the bearing portion 40 . Specifically, in the first embodiment, the pin 22 moves up and down by the length of the second longitudinal groove 44 , but in the second embodiment, it moves up and down only by the amount of play of the locking portion 45 . Therefore, in the second embodiment, the vertical movement of the work table 20 accompanying the vertical swing of the pin 22 is also small.

Further, as a modification of the second embodiment, the corner block 30 used in the present invention is formed with a recessed recessed portion 35 that does not penetrate around the engaging portion 45 of the fan-shaped surface 31 having the bearing portion 40. For example, as shown in FIG. 12, recessed hollowed portions 35 that do not penetrate are formed at four locations around the locking portion 45 so that the thick portions 36 that are not hollowed out form the engaging portion. It may be formed so as to radially extend from the periphery of the stop portion 45 toward the outer peripheral edge of the sector surface 31, and may be formed in a substantially spoke wheel shape using the locking portion 45 as a hub. The weight of the corner block 30 can be reduced while ensuring the

In addition, as shown in FIG. 12, fitting projections 37 projecting from the corner block 30 are provided so that fitting recesses formed on the side surface of the main body 2 and the upper end surface of the caster frame 3 can be used when attaching the corner block. (not shown).

In the first and second embodiments of the present invention described above, two work tables 20a and 20b are attached to the left and right sides of the packing machine main body 2 via the hinge device 10, and the upper opening of the main body 2 is double-opened. Although the work table 20a and 20b can be opened and closed in a form-like manner, only one of the two work tables 20a and 20b may be attached to the main body via the hinge device 10 of the present invention.

Alternatively, one working table 20 may cover the entire upper surface of the packing machine body 2 and the working table 20 may be attached to the body 2 via the hinge device 10 of the present invention.

In addition, in the first embodiment and the second embodiment described above, in order to provide the bearing portion 40 in which the pin (hinge shaft) 22 is inserted and which pivotally supports the pin 22, at the upper opening edge of the packing machine main body 2, The corner block 30 having the bearing 40 formed thereon is arranged at the top opening edge of the packing machine main body 2. For example, a caster frame 3 (not shown) extending to the upper end of the main body 2 is prepared, and the caster frame 3 is The bearing 40 may be formed on the upper end, or a projection (not shown) may be provided at the edge of the top opening of the packing machine body 2 and the bearing 40 may be formed on the projection. It is not limited.

In addition, in the above-described first and second embodiments, the bearings 40 are provided at the four corners of the upper opening edge of the packing machine body 2, but are not limited to this. Regarding the machine 1, as shown in FIG. Thus, the pair of bearings 40 provided at the upper opening edges of the main body 2 may be provided near the center of the main body 2 in the longitudinal direction (not shown).

Furthermore, in the present invention, the overall shape of the corner block 30 is not limited to the above embodiment, and may be an approximately 1/8 spherical body having three fan-shaped surfaces, a rectangular parallelepiped, a cube, or the like.

Further, the hinge device 10 of the present invention is not limited to the semi-automatic packing machine of the above-described embodiment, but can be applied to, for example, the working table of a fully automatic packing machine having a band guide arch on its main body.

1 packing machine 2 packing machine body 3 (3a, 3b, 3c, 3d) caster frame 4 sealing device 5 band supply device 6 control device 7 operation panel 8 band reel 10 (10a, 10b) hinge device 20 (20a, 20b) work table
21 (21a, 21b) support member 22 (22a, 22b) pin (hinge shaft)
23 screw 30 (30a, 30c, 30b, 30d) corner block 31 fan-shaped surface 32 fan-shaped surface 33 rectangular surface 34 convex curved surface 35 lightening part 36 thick part 37 fitting convex part 40 (40a, 40c, 40b, 40d) Bearing 41 Opening 42 First vertical groove 43 Horizontal groove 44 Second vertical groove 45 Locking portion 47 Vertical groove 48 Horizontal groove 80 Packing machine 82 Packing machine body 84 Sealing device 85 Band supply device 86 Control device 88 Band reel 89 (89a, 89b) work table 90 packing machine 91 body (frame)
92 work table 93 spindle 94 band welding/tightening mechanism 95 band reel 96 operator

Claims (10)

A pair of hinge shafts protruding to the left and right provided at one end of a plate-shaped work table that covers at least a part of the upper opening of the box-shaped packing machine body, and the packing to support the pair of hinge shafts A hinge device for a work table of a packaging machine, comprising a pair of facing bearings provided at the edge of the top opening of the machine body,
The bearing portion has an upwardly opening opening into which the hinge shaft can be inserted, a first longitudinal groove extending vertically downward continuously from the opening, and the first longitudinal groove. A lateral groove extending horizontally continuously from the lower end of the lateral groove, a second vertical groove extending vertically downward continuously from the tip of the lateral groove, and the hinge shaft rotatably locking the and a locking portion at the lower end of the second longitudinal groove,
A hinge device for a work table of a packaging machine, wherein the pair of hinge shafts are detachably fitted into the pair of bearings. The bearing has an upwardly opening opening into which the hinge shaft can be inserted, a vertical groove extending vertically downward from the opening, and a bottom end of the vertical groove extending continuously from the opening. 2. The operation of the packing machine according to claim 1, wherein the lateral groove extends obliquely downward with respect to the horizontal direction, and an engaging portion at the tip of the lateral groove for rotatably engaging the hinge shaft. Hinge device for the table. 3. A hinge device for a work table of a packing machine according to claim 1, wherein a wide groove is formed in said engaging portion of said bearing portion. 4. The work table according to any one of claims 1 to 3, wherein a bar-shaped support member is attached to one side end of said work table, and said pair of hinge shafts are attached to both longitudinal end faces of said support member. hinge device of the working table of the packing machine. 5. A hinge device for a work table of a packing machine according to claim 4, wherein said support member has a fan-shaped cross section. A pair of opposing corner blocks are provided at the edges of the top opening of the packaging machine body, and the pair of bearings are formed in the pair of corner blocks. Hinge device for the working table of the packing machine described in paragraph 1. The corner block is provided with a fan -shaped face consisting of a symmetrical quarter circular face formed by raising two adjacent sides of the rectangular face, and the bearing portion is formed on one of the fan-shaped faces. 7. A hinge device for a work table of a packing machine according to claim 6, wherein the hinge device is a symmetrical curved surface extending from the vertex to a side other than the two adjacent sides of the rectangular surface . In the fan-shaped surface on which the bearing portion is formed, a recessed recessed portion that does not penetrate is formed around the bearing portion, and a thick portion that is not recessed extends from the periphery of the locking portion to the outside of the fan-shaped surface. 8. A hinge device for a work table of a packaging machine according to claim 7, wherein said lightening portions are formed at a plurality of locations so as to extend radially toward the peripheral edge. A packing machine comprising a work table attached via the hinge device according to any one of claims 1 to 8 to the upper surface of the packing machine body. A packaging characterized by having a pair of work tables that open and close in a double-door manner attached via the hinge device according to any one of claims 1 to 8 on the upper surface of the main body of the packaging machine. machine.

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