JPH0419086B2 - - Google Patents

Abstract

A machine for packaging objects such as rolls or multiple rolls of paper during their high speed passage through the machine in a continuous motion generally in a single direction and substantially at a single speed. A wrapper supply mechanism feeds sheets of wrapping material (91) to lie between conveying belts above the objects (53) to be wrapped with the leading edge of the wrapper substantially ahead of the objects to be wrapped. A pair of vacuum wheels (95) alongside the path of the products on axes skewed slightly outwardly from the product path pull the wrapper (91) down in front of the product and allow it to pass underneath as the product passes so that the wrapper becomes wrapped around the top, front and bottom of the product. Specialized belts and rollers below the periphery of a the vacuum wheels assist in smooth transfer of the wrapper without permitting wrinkles at that very high speed. The product is then transferred from the belt conveyor to bars (120,121) above and below the product, with chain driven paddles (122,125) to propel the product and to wrap the upper and lower portions of the tail of the wrapper (91) about the rear of the product while at the same time differences in the coefficient of friction between the upper and lower bars snug the wrapper about the product and close any spaces between articles in a group. The ends of the wrapper are folded in and the ends and rear seam are sealed, continuously to produce wrapped products.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for a packaging machine.

In a packaging machine, a device for engaging the article or the packaging member with an arm that advances substantially linearly from a first position to a second position in the direction of movement of the article to be packaged along the path of the article is provided, e.g. This is necessary for a device for changing the conveyance direction of articles, etc. Conventionally known conveyance direction changing device (for example, Japanese Patent Publication No. 52-37263)
The article-engaging arm of the device generally reciprocates, resulting in poor operating efficiency.

SUMMARY OF THE INVENTION It is an object of the present invention to provide the above-mentioned device using an article engaging arm that moves in continuous rotation with good operating efficiency.

In order to achieve this objective, the present invention provides a first
An apparatus for a packaging machine that advances an arm substantially linearly from one position to a second position to engage the article or packaging member, and then retracts the arm and returns it to the first position, comprising: A. A pivot shaft rotatably supported; B means for rotating the pivot shaft at a first radius around a first rotation center; C a cam follower; D a second pivot shaft eccentric from the first rotation center; means for rotating the pivot shaft and the cam follower at a second radius different from the first rotation radius around the rotation center, the pivot shaft and the cam follower having equal angular velocities and the same direction of rotation; means for making the surfaces parallel; E; a nonlinear cam vertically fixed to the arm and continuously engaged with the cam follower; By moving along the
The arm is moved substantially linearly from the first position to the second position, and then the cam follower and pivot are moved along a second predetermined arc corresponding to each other, thereby causing the arm to move in a substantially straight line from the first position to the second position. By retreating and retracting in a direction substantially perpendicular to the previous direction of movement, and further moving the cam follower and the pivot along a third predetermined arc corresponding to each other, the arm moves into the first direction. A device for a packaging machine is provided, characterized in that the device is adapted to return to its position.

In a first embodiment of the invention, the L-shaped arm is
from the first position on a first conveyor for conveying articles in a first direction to the second position on a second conveyor for conveying articles in a second direction different from the first direction; By engaging with the article, the conveyance direction of the article is changed without changing the attitude of the article (see FIG. 1).

Further, in the second embodiment of the present invention, the L-shaped arm engages with the trailing portion of the packaging sheet placed over the article from the first position to the second position, so that the trailing portion of the packaging sheet is moved from the first position to the second position. Fold the packaging sheet along the surface of the article (see Figure 2).

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

FIG. 1 shows an embodiment of the invention used as a direction changing device. This direction changing device changes the direction of movement of the article, but does not cause a large change in the posture or speed of the article.

The direction changing device 50 moves the article 53 onto the linear conveyor 5.
1 (first conveyor) onto another linear conveyor 52 (second conveyor) that forms an angle with the conveyor. A pin 55 (pivot) is fixed to the L-shaped arm 54 of the direction changing device 50. Bearing 57 (first
A rotating member 56 that rotates around the center of rotation of
A pin 55 is pivotally supported by a bearing attached to the bearing. A cam plate 58 having a cam groove 59 (non-linear cam) is fixed to the top of each pin 55. A cam follower roller 60 (cam follower) extends from the second rotating member 61 and enters the cam groove 59 . Rotating member 61
is a driven member that rotates around a bearing at the center 62 (second rotation center). belt 63,6
4 is a timing belt, for example, and a rotating member 5
7 and 62 are driven at equal rotational speeds around bearings 57 and 62.

The actuation of arm 54 is synchronized with articles 53 on conveyor 51 so as to contact the backs and ends of the articles.
The shape of the arm 54 is adapted to the type shape of the articles so that several articles forming the article to be packaged are conveyor 51.
The articles are set to be placed on the transfer path 92 without changing their posture by preventing separation between the articles when they are transferred from the container to the conveyor 52. The axis of the conveyor 51 and the article transfer path 92, that is, the axis of the conveyor 52 are perpendicular to each other. The trajectory of the tip of arm 54 is shown in dashed lines in FIG. The arm 54 advances almost directly from a first position a on the conveyor 51 to a second position b on the conveyor 52, pushes the article 53, and then retracts to the side and then pushes the article 53 on the infeed conveyor 51 with high acceleration. It contacts and transfers the article, and the cycle repeats. The number of arms and the shape of the cam can be varied as required. The method of mounting the cam and cam follower can also be reversed.

FIG. 2, FIG. 3, and FIG. 4 show an embodiment of the present invention used as a tatsuka (wrapping sheet folding device).

The arm 71 is an L-shaped arm, and the locus of its tip is shown by a chain line in FIG. The arm 71 is fixed to a shaft 72 (pivot). A shaft 72 is pivotally supported by a bearing attached to a rotating member 73 that is rotationally driven around a central axis 74 (first rotation center). A cam groove 76 is formed on a cam plate 75 fixed to each shaft 72.
(non-linear cam) is provided. A cam follower 78 attached to the second rotating member 77 is connected to the cam groove 7.
It's within 6. The second rotating member 77 is a shaft 79
(second rotation center). Members 73 and 7 are connected by timing belts 80 and 81.
Make the rotation speeds of 7 equal.

The article transfer path 92 has tack arms 71 on both sides thereof which advance almost linearly from the first position a to the second position b.
pass through the middle of The packaging sheet 91c is placed along both sides of the article moving in the direction of the path 92.
It is bent by a pair of arms 71 on both sides of 2.
FIG. 3 shows a case in which there is one item to be packaged, for example, a toilet paper roll, and FIG.
The case of two pieces 53a and 53b is shown. Figures 3 and 4
In the figure, 125 is a member that propels the article along the path 92, and 141 is a device that cooperates with the arm 71 to fold the packaging sheet 91c relative to the article. You can also change the number of arms as needed.

The cam grooves 59, 76 are defined so as to obtain the above-mentioned movement trajectory of the arm.

[Brief explanation of drawings]

FIG. 1 is a plan view of a direction changing device that is an embodiment of the present invention. FIG. 2 is a plan view of a packaging sheet folding device according to another embodiment of the present invention. 3 and 4 are perspective views showing a state in which articles are packaged using the apparatus shown in FIG. 2; FIG. 50... Direction changing device, 51, 52... Conveyor, 53... Article, 55, 72... Pivot, 57,
74...First rotation center, 59,76...Nonlinear cam, 60,78...Cam follower, 62,79...
...Second center of rotation.

Claims (1)

[Claims] 1. The arms 54, 71 are advanced substantially linearly from the first position a to the second position b in the direction of movement of the article along the path of the article or the packaging member. A device for a packaging machine that engages the arm and then retracts the arm and returns it to the first position, comprising: A pivot shafts 55, 7 that rotatably support the arm;
2; B means for rotating the pivot shaft at a first radius around the first rotation center 57, 74; C cam follower 60, 78; D means for rotating the cam follower at a first radius eccentric from the first rotation center; means for rotating the pivot shaft and the cam follower at a second radius different from the first rotation radius around the rotation centers 62 and 79 of the second rotation axis, the angular velocity of the pivot shaft and the cam follower being equal, and the rotation directions thereof being the same. and means for parallelizing the raceway surfaces; E non-linear cams 59, 76 rigidly fixed to said arm and continuously engaged with said cam follower; said cam follower and pivot axis corresponding to each other; By moving along a first predetermined arc,
The arm is moved substantially linearly from the first position to the second position, and then the cam follower and pivot are moved along a second predetermined arc corresponding to each other, thereby causing the arm to move in a substantially straight line from the first position to the second position. By retreating and retracting in a direction substantially perpendicular to the previous direction of movement, and further moving the cam follower and the pivot along a third predetermined arc corresponding to each other, the arm moves into the first direction. A device for a packaging machine, characterized in that it is adapted to return to its position. 2. The L-shaped arm 54 moves from the first position on the first conveyor 51 for conveying the article in a first direction to a second position for conveying the article in a second direction different from the first direction. 2. The device according to claim 1, wherein the conveyance direction of the article is changed by engaging the article up to the second position on the conveyor 52 without changing the attitude of the article. 3 The L-shaped arm 71 engages with a subsequent portion of the packaging sheet placed over the article from the first position to the second position, thereby moving the subsequent portion of the packaging sheet along the surface of the article. The device according to claim 1, which is folded in such a manner as to