JPH09226723A - Interval control device for grip of packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a tip interval adjustment of grips at two locations by a single device by a method wherein when the cam roller of the grip is in contact with an opening/closing piece, an opening/closing rod is operated by the rotation of the cam, and the interval of the tip of the grip main body is adjusted to be wider or narrower for the constitution. SOLUTION: A cam lever 30 rocks by a cam 33 which is rotated by a driving motor and moves an opening/closing rod 25 downward. By doing so, an opening/ closing piece 14 advances in the radial direction of a fixed cam 5 with which the cam roller 51 is in contact, and moves on the extended curve of the cam. When the cam roller 51 is located on the opening/closing piece 14, if the opening/closing rod 25 moves upward, which the opposite direction, by the cam 33, the opening/closing piece 14 returns to the original position. By doing so, the grip (g) is adjusted so as to approach slightly inward. The motion of such an opening/closing piece 14 is simultaneously performed at a feeding station and an opening station, and at the opening station, the grip interval is adjusted so as to further approach inward.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grip distance control device in a packaging machine for adjusting the distance between the tips of grips for gripping or releasing a packaging bag to be wide or narrow.

[0002]

2. Description of the Related Art In a packaging machine, a cam roller provided on an opening / closing lever linked to one grip body of a pair of grip bodies is brought into contact with a circular fixed cam, and the opening / closing lever swings to move the grip body. A large number of grips with adjustable corresponding intervals are projected in the radial direction of the intermittent rotator, and the packaging bags supplied at the supply station are gripped in sequence by the grips, opening station, filling station, and top seal. It has a structure in which bags are packed while being moved to each station such as a station, which has been conventionally practiced and is known. The operation of the grip is to receive the packaging bag in a state in which it is wider than the bag width at the bag supply station, then shrink the bag inward and then grip the packaging bag, and further shrink the bag at the opening station to facilitate opening. is there. The conventional gap control device that controls the operation of the grip is configured to adjust the corresponding gap of the grip body by operating the control lever with the cam lever that swings by the rotation of the cam. Were installed in each.

[0003]

Since the above-mentioned conventional interval control device has the same structure at two places, the structure of the packaging machine becomes complicated and the cost becomes high, and maintenance and adjustment work is troublesome. There was the inconvenience of hanging.

Therefore, it is an object of the present invention to provide a device which allows adjustment of the tip distance between two grips with a single device, and which has a simple structure and facilitates maintenance and adjustment work.

[0005]

In order to achieve the above object, the invention according to claim 1 is to contact a circular fixed cam with a cam roller provided on an opening / closing lever linked to one grip body of a pair of grip bodies. Then, a large number of grips whose corresponding intervals in the grip body can be adjusted by the swinging motion of the opening / closing lever are provided in a projecting manner in the radial direction of the intermittent rotating body, and the packaging bags supplied at the supply station are sequentially hung by each grip. In a packaging machine that performs bag packing while grasping in a downward shape and moving to each station such as an opening station, a filling station, and a top seal station, opening and closing corresponding to a cam roller at the cutout portion of the fixed cam at the supply station and the opening station The brackets are provided with substantially L-shaped first and second release control levers facing each other so that they can freely swing. A pair of tuning levers provided on a rotatably supported fulcrum shaft and the release control levers are connected by open / close rods, respectively, and contacted with an intermediate lever provided on the fulcrum shaft and a cam rotated by a drive motor device. The cam lever of the grip is connected with an intermediate rod, and when the cam roller of the grip is in contact with the opening / closing piece, the opening / closing rod is operated by the rotation of the cam to adjust the gap between the tips of the grip body to be wide or narrow. It is characterized in that it is configured to.

According to a second aspect of the invention for achieving the same object, in the grip spacing control device for a packaging machine according to the first aspect, one end of the opening / closing rod has the tuning lever or the release control lever. It is characterized in that it is movably attached via a spring to a piece piece that is freely rotatable.

[0007]

When the cam lever is swung by the cam rotated by the drive motor device and the open / close rod is moved downward, the open / close piece moves forward in the radial direction of the fixed cam with which the cam roller of the grip contacts. Move on the extension curve of the cam. When the opening / closing rod is moved upward by the cam in the opposite direction to the above when the cam roller is on the opening / closing piece,
The opening / closing piece retracts to its original position. As a result, the grip is adjusted so as to approach a little inward. The operation of the opening / closing piece is performed at the supply station and the opening station at the same time, but in the opening station, the grips are brought closer to the inside and adjusted to a narrow interval.

Since the retreating amount of the opening / closing piece is different between the supply station and the opening station, that is, the grip space adjustment amount is different, the difference is absorbed and adjusted by the spring attached to the opening / closing rod. . It is possible to adjust the difference by changing the lever ratio of the tuning lever to the intermediate lever without depending on the opening / closing rod, but according to the spring structure, the amount of movement of the opening / closing piece is finely adjusted. There is an advantage that can be done.

This grip distance control device can operate a release control lever for adjusting the tip distance between two grips with a single device. Moreover, since the structure is simple and compact, there are advantages that maintenance and adjustment work are easy to perform and the cost is low.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a side view showing the entire grip device, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, FIG. 3 is a side view showing a connecting portion between an opening / closing rod and a tuning lever, and FIG.
FIG. 5 is a plan view for explaining the positional relationship between the opening / closing piece and the fixed cam, FIG. 6 is a plan view of the grip, and FIG. 7 is C- of FIG.
It is a C line sectional view.

In FIG. 1, E is a grip interval control device installed in a rotary type packaging machine. In the packaging machine referred to herein, a large number of grips g are provided in a projecting manner in the radial direction of the intermittent rotator 4, and the packaging bags b supplied at the supply station i are sequentially held in a hanging shape by the grips g and the opening station ii. , Filling station iii, iv, idle station v, top seal stations vii-ix, take-out station x, etc.

As shown in FIG. 1, a stand 2 containing an index shaft (not shown) is provided on a machine base 1 of the packaging machine, and a base 3 is fixed to the outside of the stand 2. A bracket 10 having a horizontal shaft 11 fixed thereto is attached to the lower surface of the base 3 located at the supply station i and the opening station ii, and each of the shafts 11 has a substantially L-shaped first bracket.
The release control lever 12 and the second release control lever 12a are rotatably provided respectively. Opening / closing pieces 14 and 14a corresponding to a cam roller 51 described later are attached to the vertical pieces 13 and 13a of the release control levers 12 and 12a. As shown in FIG. 5, the opening / closing pieces 14 and 14 a are arranged in the notches 6 and 7 of the circular fixed cam 5 provided on the outer periphery of the stand 2. Reference numerals 15 and 15a denote adjusting bolts for adjusting the original positions of the opening / closing pieces 14 and 14a, and the vertical pieces 13 and 1a.
It is provided so as to be screwed onto 3a and come into contact with the outer surface of the stand 2.

Reference numeral 21 is a fulcrum shaft rotatably supported by bearing units 20 and 22 attached to the lower surface of the machine base 1. As shown in FIG. 4, the piece 24, 2 is attached to the fulcrum shaft 21.
4a is a pair of tuning levers 23 and 23a that are freely rotatable.
Is fixed. The first and second release control levers 12, 1
One end of the open / close rods 25, 25a connected to the free end of 2a is movably inserted through the piece pieces 24, 24a via a spring 26, and then tightened and fixed by nuts 27, 27a. A dogleg-shaped cam lever 30 is swingably supported below the machine base 1, and a cam follower 32 provided on the lever 30 is biased by a spring 34 to a cam 33 which is rotated by a drive motor device (not shown). Contact. The intermediate lever 35 provided on the fulcrum shaft 21 and the lateral piece 31 of the cam lever 30 are connected by an intermediate rod 36.

In FIG. 6, g shows an example of a grip provided on the intermittent rotating body 4. A set of vertical axes 4 arranged according to the number of stations on the lower surface of the peripheral portion of the intermittent rotating body 4.
A pair of left and right holders 41, 41 are rotatably supported on the 0, 40, and the projecting pieces 42 of the both holders 41, 41 are connected by a link 43. A movable pressing piece 47 is connected to the inside of the grip body 44 fixed to the holder 41 in parallel through parallel links 45 and 46. Movable pressing piece 47
Attach one end of a rod 49 to which the compression spring 48 is externally fitted, and loosely fit the other end of the rod 49 into the grip body 44.
The tip of the movable pressing piece 47 is configured to elastically press the tip of the grip body 44 by the compression spring 48. Reference numeral 49 is a tension spring for urging the grip bodies 44, 44 inward.

Reference numeral 50 denotes an opening / closing lever that is rotatably supported on the vertical axis 40 by being stacked below the holder 41. The cam roller 51 attached to the tip of the opening / closing lever 50 is urged by a spring (not shown) to be fixed. It is provided so as to contact the cam 5. Arm 41a projecting inside holder 41
A first link 52 pivotally supported by the second link 53 and a second link 53 pivotally supported by the opening / closing lever 50 are connected by a pin 54. Further, the other end of a third link 56 pivotally supported by a ring 55 that rotates together with the intermittent rotating body 4 is connected to the pin 54. Then, when one of the grip bodies 41 is moved by the swinging motion of the opening / closing lever 50, the other grip body 41 is connected to the one grip body 41 and the link 4
Since the three grip bodies 41 are connected with each other, the corresponding intervals of the grip bodies 41 are configured to operate in synchronization with each other so that the corresponding intervals are wide or narrow.

The operation of the grip distance control device E having such a configuration will be described. When the grip g for gripping or releasing the packaging bag b approaches the supply station i from the previous process, the cam lever 30 swings by the rotation of the cam 33, and the open / close rod 25 is moved downward. As a result, the opening / closing piece 14 of the first release control lever 12 advances in the radial direction of the fixed cam 5 with which the cam roller 51 of the grip g contacts and stands by on the extension curve of the cam 5. The grip g is opened larger than the bag width at the large diameter portion of the fixed cam 5, and moves on the opening / closing piece 14 in that state. When the packaging bag b is supplied here, the open / close rod 25 is rotated by the cam 33 that continues to rotate.
Moves upward to retract the opening / closing piece 14 to the original position. As a result, the grip g is adjusted so as to approach a little inward, and is controlled by a separate device to grip the packaging bag b.

Since the opening station ii is also provided with the opening / closing piece 14a of the second release control lever 12a, when the grip g holding the packaging bag b of the one-letter bag mouth approaches the opening station ii, The same operation as i is performed at the same time. That is, when the opening / closing piece 14a receives the cam roller 51 at the advanced position and then moves backward,
The grip g is further moved inward and adjusted to a narrow interval. At this time, the packaging bag b is opened by an opening device separately provided with a suction cup.

As described above, according to the grip distance control device, the release control lever for adjusting the tip distance between the two grips can be operated by a single device, which has a simple and compact structure. Therefore, maintenance and adjustment work becomes easy.

[Brief description of drawings]

FIG. 1 is a side view showing an entire grip device.

FIG. 2 is a view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a side view showing a connecting portion between the opening / closing rod and the tuning lever.

FIG. 4 is a view taken in the direction of arrow B in FIG. 1;

FIG. 5 is a plan view illustrating the positional relationship between the opening / closing piece and the fixed cam.

FIG. 6 is a plan view of the grip.

7 is a sectional view taken along line CC of FIG.

[Explanation of symbols]

b → packaging bag g → grip E → grip interval control device 1 → machine stand 4 → intermittent rotating body 5 → fixed cam 10 → bracket 12 → first release control lever 12a → second release control lever 14, 14a → opening / closing piece 21 → fulcrum shaft 23, 23a →
Tuning lever 25, 25a → Open / close rod 30 → Cam lever 33 →
Cam 35 → Intermediate lever 36 → Intermediate rod 44 → Grip body 50 → Open / close lever 51 → Cam roller

Claims (2)

[Claims] 1. A pair of grip bodies is provided with an opening / closing lever linked to one of the grip bodies, a cam roller is brought into contact with a circular fixed cam, and the corresponding interval of the grip bodies can be adjusted by swinging the opening / closing levers. A large number of grips project in the radial direction of the intermittent rotator, and the packaging bags supplied at the supply station are gripped in sequence by each grip and moved to the opening station, filling station, top seal station, and other stations. In the packaging machine for performing bag filling while allowing the bag to be packed, the L-shaped first and second release control levers having opening and closing pieces corresponding to the cam rollers facing the notches of the fixed cam are provided on the bracket at the supply station and the opening station. Each can be freely rocked,
A pair of tuning levers provided on a fulcrum shaft rotatably supported on the machine base and the release control levers are connected by open / close rods, respectively, and are rotated by an intermediate lever provided on the fulcrum shaft and a drive motor device. An intermediate rod is connected to the cam lever that swings in contact with the cam, and when the cam roller of the grip is in contact with the opening / closing piece, the opening / closing rod is operated by the rotation of the cam to widen the gap between the tips of the grip body. Alternatively, a grip interval control device in a packaging machine, characterized in that the device is configured to be adjusted narrowly. 2. The grip spacing control device for a packaging machine according to claim 1, wherein one end of the opening / closing rod is provided with a spring on a piece piece rotatably provided on the tuning lever or the release control lever. A grip interval control device in a packaging machine, which is movably attached.