JPH09309505A - Member sliding mechanism in work machine - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To slide a sliding member along a guide member extending in a predetermined direction so that a predetermined work member is attached to the sliding member. An object is to achieve smooth sliding in a member sliding mechanism configured to perform work. A slide block (71) is composed of a main body (72) to which a working member is attached, and cylindrical rotary bodies (77, 77) that are rotatably supported by the main body (72). A fitting groove 76 for fitting with the sliding guide plate 81 is formed in the rotating body 77, and a fitting length L ′ between the fitting groove 76 and the sliding guide plate 81 is defined as a length L of the main body 72. Set shorter than.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a member sliding mechanism in a working machine such as a packaging machine for automatically film-wrapping an article to be packaged.

[0002]

2. Description of the Related Art A packaging machine for automatically packaging a packaged product such as a fresh food product with a tray together with a film is disclosed in JP-A-6-72.
As disclosed in Japanese Patent Publication No. 406, while holding a packaging film which has been cut into a predetermined size in a tension state, a tray containing the article to be packaged is pushed up against the film to cover the film on the article to be packaged. After covering, the front, rear, left and right peripheral portions of the packaging film are folded on the bottom surface side of the tray for packaging.

In this case, the folding operation of the packaging film is performed by advancing and retracting a plurality of folding plates from the lateral lateral direction toward the tray at a height position of the tray bottom, and generally such folding is performed. As a mechanism for moving the plate back and forth, a guide plate is extended in the direction in which the folding plate is moved forward and backward, and the guide plate is slidably fitted so as to hold a grooved slide block. Then, a member sliding mechanism is used in which the folding plate is attached to the block and slid along the guide plate.

[0004]

However, this kind of member sliding mechanism has the following problems to be solved.

That is, in the case of the film folding work of the above-mentioned example, while the sliding guide plate is installed horizontally in the tray direction, a linear fitting groove is formed in the slide block to ensure that the slide block is properly aligned. Sliding horizontally,
As a result, it is desirable that the folding plate provided on the block moves back and forth at an appropriate position with respect to the bottom surface of the tray to perform a good film folding operation. The width is made almost the same as the thickness of the guide plate to reduce the clearance and prevent the slide block from swinging.

However, as shown in FIG. 5, the slide block S needs to have an area or a length L so that the folding plate can be stably attached. Therefore, the clearance C of the fitting groove m of the slide block S is required. As shown by the chain line in the figure, when the guide plate G is slightly bent, the guide plate G is slightly bent or bent, so that the gap between the guide plate G and the slide block S is A,
If a portion such as B is caught, smooth sliding in the x and y directions becomes impossible, and if the clearance C is increased in order to avoid this, the slide block S shakes as described above and the film The height position of the folding plate with respect to the tray is not constant and packaging failure occurs.

In order to deal with this, the flatness of the sliding guide plate, the dimensional accuracy of the slide block,
Alternatively, if it is attempted to improve the assembling accuracy of these, the cost of the sliding mechanism of this type is increased.

Such a problem is not limited to the film folding work in the above-mentioned automatic packaging machine, but also when the packaged product is pushed and discharged outside the machine by advancing and retracting the discharging member, and generally, It occurs commonly in various work machines when a sliding member slides along a guide member, thereby aligning a predetermined working member with respect to the work piece to move it back and forth. To do.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a member sliding mechanism in a working machine, which has a simple and inexpensive structure and is capable of correctly sliding a sliding member along a guide member.

[0010]

Means for Solving the Problems To solve the above problems, the present invention is specified as follows.

That is, the invention according to claim 1 of the present invention (hereinafter referred to as the "first invention") includes a guide member extending in a predetermined direction and slidably engaged with the guide member. And a sliding member that is mounted on the sliding member, and the sliding member slides along the guide member to perform a predetermined work on the workpiece with the working member attached to the sliding member. A member sliding mechanism in a machine, wherein the sliding member comprises a main body to which a working member is attached, and a rotating body axially supported by the main body so as to be rotatable relative to the main body. The engaging portion that engages with is provided so as to be shorter than the length of the main body.

According to the first aspect of the present invention, the sliding member that slides along the guide member includes the main body to which the working member is attached, and the rotating body that is rotatably supported by the main body. Since the rotating body engages with the guide member with a length shorter than the length of the main body, even if the guide member is curved with a large curvature with respect to the length of the main body, The engaging rotating body can follow the bend, resulting in
The sliding of the sliding member is not caught, and the main body or the working member is self-aligned and smoothly moves along the guide member.

The invention according to claim 2 (hereinafter referred to as "second
Invention ". ) In the above-mentioned first invention, two rotating bodies are provided in the main body.

According to the second aspect of the present invention, since the two rotating bodies which engage with the guide member are provided with a length shorter than the length of the main body, the main body or the working member is provided with a guide member. Stability will be achieved.

Further, in the invention described in claim 3 (hereinafter referred to as "third invention"), in the first invention or the second invention, the engaging portion of the rotating body is a groove portion fitted with the guide member. It is characterized by being.

According to the third aspect of the present invention, the rotor is formed with the groove, and the rotor is engaged with the guide member by fitting the groove and the guide member.

The invention according to claim 4 (hereinafter referred to as the "fourth invention") is the packaging machine for packaging the article to be packaged with a film according to any one of the first to third inventions. The working member, which is a machine, is a film folding member that folds a film on the side of the packaged item by moving back and forth with respect to the packaged item, or a discharge member that discharges the packaged item in a predetermined direction. It is characterized by being at least one.

According to the fourth aspect of the invention, the problems caused by the film folding operation and the packaged product discharging operation in the above-described packaging machine can be eliminated.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention applied to a packaging machine will be described below.

First, the overall structure of the packaging machine 1 according to this embodiment and the flow of the article to be packaged X will be described with reference to FIG. 1. In the central portion of the front surface of the main body frame 1a of the packaging machine 1, weighing is performed. A weighing-in / carrying-in device 2 having a container 21 and a carry-in conveyor 22 is arranged. First, the articles to be packaged X accommodated in the tray T are loaded onto the weighing-in / carrying-in device 2 and the weighing machine 21
After being weighed in, the carry-in conveyor 22 carries it into the machine as indicated by arrow A.

Further, a lifting device 3 which moves up and down is provided inside the packaging machine 1, and the article X to be packaged carried in by the carrying-in device 2 is transferred to the lifting device 3 and is indicated by an arrow a. It is pushed up.

On the other hand, above the lift device 3, there is provided a film holding device 4 for horizontally tensioning and holding the packaging film F fed from a film roll (not shown) and cut into a predetermined size.

The film holding device 4 includes two guide bars 41, 41 (only one is shown in FIG. 1) installed in the front-rear direction on the left and right sides of the main body frame 1a, and the front of each guide bar 41, 41. Front fixed body 4 externally fitted and fixed by
2, 42, the rear movable bodies 43, 43 that are also slidably fitted on the rear portions of the respective guide bars 41, 41, and the front fixed bodies 42, 42 or the rear movable bodies 43, 43. It has a pair of upper and lower film sandwiching conveyors 42a, 42b; 43a, 43b, respectively, and the sandwiching conveyors 42a, 42b; 43a, 43b sandwich both side edges of the packaging film F. The film F is held in a tensioned state above the lift device 3, and the packaged product X pushed up by the lift device 3 is covered by the packaging film F as shown by the chain line in the figure. .

Below the rear portions of the guide bars 41, 41, there are arranged film width adjusting conveyors 44, 44 having rear movable bodies 43, 43 fixedly mounted on the upper running surfaces thereof, and the motor 45 is provided with a motor. By driving, the distance between the front fixed bodies 42, 42 and the rear movable bodies 43, 43 can be adjusted according to the width dimension of the packaging film F.

At the upper part of the packaging machine 1, there is provided a film folding device 5 which wraps the product X covered with the film F in this manner with the tray together with the film F.

The film folding device 5 is a lift device 3.
A pressing plate 51 for tightly adhering the packaging film F to the upper surface of the packaged product X pushed up by, and a pair of film folding plates 52, 52 arranged opposite to each other on the left and right sides of the body frame 1a (only one is shown in FIG. 1) A rear film folding plate 53 arranged immediately above the folding plates 52, 52, and a rear folding plate 5
3 has a discharge pusher 54 disposed immediately above the left and right folding plates 52, the left and right folding plates 52, 52 are moved toward and away from each other along the length direction of the film F by driving a motor (not shown), and the rear folding is performed. A plurality of link members 56a, 56b, 56c, 56 are driven by a motor 55 provided on the mounting frame 5a on the upper rear side of the body frame 1a.
the width direction of the film F through d, that is, the packaging machine 1
Similarly, the discharging pusher 54 is driven by a motor 57 also provided on the mounting frame 5a via a belt transmission mechanism 58 to similarly move the packaging machine 1 in the same direction.
It is adapted to move back and forth in the front-back directions a and b.

After the left and right peripheral edges of the packaging film F extended as shown by the chain line in the figure by the folding plates 52, 52, 53 are folded on the bottom side of the tray T, respectively. The article to be packaged X is ejected out of the machine by the ejection pusher 54 as shown by the arrow C, and the front peripheral portion of the packaging film F remaining at this time is also folded into the bottom surface side of the tray T by the rollers 59.

Then, the film F folded on the bottom side of the tray T is heat-sealed by the sealing device 6 arranged on the upper front surface of the main body frame 1a, whereby the packaging of the article to be packaged X is completed.

In this case, the packaging machine 1 is constructed so that the rear film folding plate 53 and the discharge pusher 54 of the film folding device 5 are moved forward and backward in the front-rear direction a, b by the member sliding mechanism. . Next, the sliding mechanism will be described in more detail with reference to FIGS.

FIG. 2 is a plan view showing the structure of the rear film folding plate 53, the discharge pusher 54, and the sliding mechanism thereof.
FIG. 3 is a slide block (sliding member) in the mechanism.
71 is a sectional view from the front direction of the packaging machine 1 showing an enlarged state of engagement between the sliding guide plate (guide member) 71 and the sliding guide plate 81, and FIG.
1. It is a side view from the same direction as FIG. 1 which expands and shows the mode of engagement with 1.

First, the structure of the rear film folding plate 53 and the discharge pusher 54 will be described. The folding plate 53 has bearing members 53b, 5 on the front portion of a rectangular base plate 53a.
The folding roller 53c is rotatably provided via the 3b, and when the base plate 53a or the folding plate 53 advances in the a direction, the roller 53c is rearward on the bottom surface of the tray T pushed up by the lift device 3. And the rear edge of the packaging film F is brought into close contact with the bottom surface and folded. Further, the discharge pusher 54 is composed of a plate-shaped member 54a bent into a predetermined shape, and its front end portion 54b is erected, and when the plate-shaped member 54a or the discharge pusher 54 is advanced in the direction a. The front end standing portion 54b presses the tray T from the rear side and discharges the article to be packaged X in the front direction of the packaging machine 1.

Slide blocks (sliding members) 71 ... 71 are attached to both sides of the base plate 53a of the folding plate 53 and both sides of the plate member 54a of the discharge pusher 54, respectively. The slide blocks 71 ... 71 are slidably engaged with a pair of left and right sliding guide plates (guide members) 81, 81 extending in the front-rear direction of the main body frame 1a, that is, in the a and b directions.

The slide block 71 has a main body 72 in the shape of a rectangular parallelepiped.
Both sides of the base plate 53a are fixed to the lower surface of the base plate 53a with screws 53e ... 53e sandwiching the spacers 53d, 53d, respectively. The parts 54c and 54c are fixed by screws 54d ... 54d, respectively.

The guide plate 8 is provided on the main body 72.
A concave groove 73 having a width wider than the thickness of 1, 81 is formed in the longitudinal direction, and circular concave portions 74, 74 and through holes 75, 75 concentric with the circular concave portions 74, 74 are provided at two positions before and after the concave groove 73. The circular recesses 74, 74 and the through holes 75,
75, a fitting groove 76 for fitting with the sliding guide plate 81,
Cylindrical rotating body 7 of short and small dimensions in which 76 is formed on the diameter line
7, 77 are incorporated so as to be rotatable relative to the main body 72.

Here, each rotating body 77 has a columnar portion 77a in which the fitting groove 76 is formed and a locking portion 77b protruding from the center of the columnar portion 77a. With the circular recess 74 of the main body 72 fitted, the locking portion 7
7b is inserted into the through hole 75 of the main body 72, whereby the rotating body 77 is rotatably supported by the main body 72 as shown by an arrow r in FIG. The diameter of 77a is set smaller than the length of the short side of the main body 72, so that the fitting groove 76 formed on the diameter line of the cylindrical portion 77a has a length L'shorter than the length L of the main body 72. Are fitted with the sliding guide plate 81.

Further, the width of the fitting groove 76 of the rotating body 77 is narrower than that of the concave groove 73 of the main body 72, and the clearance C'with the sliding guide plate 81 is, for example, 0.1 mm.
It is set to a small value. On the other hand, the concave groove 7 of the main body 72
The clearance C between the sliding guide plate 81 and the sliding guide plate 81 is set to a large value, for example, about 1 to 2 mm as described above.

Next, these slide blocks 71 ... 7
A drive unit for sliding the first to rear folding plates 53 or the discharge pusher 54 along the sliding guide plates 81, 81 will be described.

First, the drive portion of the folding plate 53 has a motor 55 provided on the mounting frame 5a at the upper rear part of the main body frame 1a, and the drive shaft 55a of the motor 55 is integrally provided with the first link member 56a. And the first
A second link member 56b is rotatably attached to the tip of the link member 56a. A shaft 56e is rotatably supported on the upper portion of the mounting frame 5a in a direction orthogonal to the sliding guide plates 81, 81, and a relatively long third link member is provided at both ends of the shaft 56e. 5
6c and 56c are integrally provided, respectively,
The other end of the second link member 56b is rotatably attached to the intermediate portion in the length direction of the one third link member 56c. The pins 72a, 72 are attached to the main bodies 72, 72 of the slide blocks 71, 71 on the folding plate 53.
a is projected, and these pins 72a, 72
2a and the lower end portions of the third link members 56c, 56c, the fourth link members 56d, 56d having adjustable lengths.
Are rotatably connected to each other. With such a configuration, the third link members 56c, 56c swing around the shaft 56e by the forward and reverse rotations of the motor 55, and the slide blocks 71 ... 71 or the rear folding plate 53 move to the fourth position.
The sliding guide plate 81, via the link members 56d, 56d,
It slides in the front-back direction a, b of the said packaging machine 1 along 81.

On the other hand, the drive unit of the discharge pusher 54 also has a motor 57 provided on the mounting frame 5a, and the drive shaft 57a of the motor 57 has a transmission pulley 5 attached thereto.
8a is integrally provided, and each sliding guide plate 8
1, 81 includes a pair of front and rear pulleys 82a, 82b;
a and 82b are brackets 83 ... 83 and support shafts 84a and 8
4b, and these front and rear pulleys 82a, 82a
2b; Timing belt 8 for sliding between 82a and 82b
5, 85 are stretched endlessly. Further, a transmission pulley 84c is integrally provided on the rear side support shaft 84b, and a timing belt 86 is stretched endlessly between the pulley 84c and the pulley 58a of the motor 57 to form the belt transmission mechanism 58. It is configured. Then, the discharge pusher 54
Main body 72,7 of each slide block 71,71 in
Bending both sides 54 of the plate-like member 54a to which 2 is attached
c, 54c, the sliding timing belts 85, 85
The lower running surfaces are fixed by fixing members 85a and 85a, respectively. With such a configuration, the forward / reverse rotation of the motor 57 causes the slide blocks 71 to pass through the belt transmission mechanism 58 and the sliding timing belts 85, 85.
... 71 or the discharge pusher 54 is the sliding guide plates 81, 8
1 will slide in the front-back direction a, b of the packaging machine 1.

With the above-described structure, in this packaging machine 1, when the lifted device 3 pushes the packaged item X and the tray T upward, the motor 55 is driven and the package is attached to the rear film folding plate 53. Slide block 7
1, 71 slide forward along the sliding guide plates 81, 81 in the direction a, whereby the folding plate 53 abuts from the rear side along the bottom surface of the tray T and the rear edge portion of the packaging film F is removed. After being folded into the bottom surface of the tray T, the slide blocks 71, 7 attached to the discharge pusher 54 are driven by the motor 57 while sliding and retracting in the direction b.
1 slides forward along the sliding guide plates 81, 81 in the a direction, whereby the discharge pusher 54 pushes the tray T from the rear side and discharges the packaged product X toward the sealing device 6 to the outside of the machine. After that, it slides and retreats in the b direction.

At this time, a slide block 71 sliding along the slide guide plate 81 is provided with a main body 72 fixed to the rear film folding plate 53 or the discharge pusher 54.
The main body 72 is composed of two cylindrical rotary bodies 77, 77 rotatably supported relative to each other, and the rotary bodies 77, 77 are slidable with a length L ′ shorter than the length L of the main body 72. Since it is fitted with the motion guide plate 81, as shown by the chain line in FIG.
Even if the sliding guide plate 81 is curved with a large curvature with respect to the length of the main body 72, the rotating bodies 77, 77 engaging with the guide plate 81 can follow the bending, and as a result, The sliding of the slide block 71 does not get caught, and the main body 72 or the rear film folding plate 53 or the discharge pusher 54 is automatically aligned and smoothly moves back and forth along the guide plate 81 in the a and b directions. .

Further, since there are provided two cylindrical rotating bodies 77, 77 which fit with the sliding guide plate 81, the main body 72 is provided.
Further, the rear film folding plate 53 or the discharge pusher 54 is supported by the guide plate 81 at two points, so that the running stability thereof is achieved.

[0043]

As described above, according to the present invention, the sliding member that slides along the guide member has the main body to which the working member is attached and the rotary member that is rotatably supported relative to the main body. Since the rotating body is engaged with the guide member with a length shorter than the length of the main body, even if the guide member is curved with a large curvature with respect to the length of the main body, The rotating body that engages with the guide member can follow the bending, and as a result, the sliding of the sliding member does not get caught, and the main body or working member is self-centering and smoothly guided. Therefore, the sliding member can be correctly slid along the guide member with a simple and inexpensive structure.

[Brief description of drawings]

FIG. 1 is a schematic side view showing a main configuration of a packaging machine to which the present invention is applied.

FIG. 2 is a plan view of a member sliding mechanism of the packaging machine.

FIG. 3 is an enlarged cross-sectional view of a main part of the sliding mechanism.

FIG. 4 is an enlarged side view of a main part of the sliding mechanism.

FIG. 5 is an explanatory diagram of a problem of a conventional member sliding mechanism.

[Explanation of symbols]

 1 Wrapping Machine 5 Film Folding Device 53 Rear Film Folding Plate 54 Ejection Pusher 71 Slide Block 72 Block Body 76 Fitting Groove 77 Cylindrical Rotating Body 81 Sliding Guide Plate F Packaging Film T Tray X Packaged Items

Claims (4)

[Claims] 1. A guide member extending in a predetermined direction, and a slide member slidably engaged with the guide member, the slide member sliding along the guide member. A member sliding mechanism in a working machine for performing a predetermined work on a work by the working member attached to the sliding member, wherein the sliding member has the working member attached thereto. It is composed of a main body and a rotating body rotatably supported by the main body, and the rotating body is provided with an engaging portion that engages with the guide member and is shorter than the length of the main body. Characteristic member sliding mechanism in working machines. 2. The member sliding mechanism for a working machine according to claim 1, wherein two rotating bodies are provided on the main body. 3. The member sliding mechanism for a working machine according to claim 1, wherein the engaging portion of the rotating body is a groove portion that fits with the guide member. 4. The working machine is a wrapping machine for wrapping an article to be packaged with a film, and the working member moves forward and backward with respect to the article to be packaged to fold the film on the side of the article to be packaged. The member sliding mechanism for a working machine according to claim 1, wherein the member sliding mechanism is at least one of a film folding member and a discharging member that discharges the article to be packaged in a predetermined direction.