Carriage For A Stretch Wrapping Machine
A stretch wrap assembly comprising a base, a turntable mounted on the base, a column on the base and a carriage movable upon the column. The carriage includes a first, second, third and fourth nip rollers and first and second pre-stretch rollers. The carriage is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, the first pre-stretch roller, the second pre-stretch roller, and the fourth nip roller and to the package. The nip rollers can be on a chassis to be able to move rotationally and laterally relative to the first pre-stretch roller and the second pre-stretch roller.
This application claims priority to U.S. Provisional Patent Application No. 61/244,573, entitled CARRIAGE FOR A STRETCH WRAPPING MACHINE, which was filed on Sep. 22, 2009, the entire contents of which are hereby incorporated herein by reference.
FIELD OF THE INVENTIONThe present invention concerns stretch wrapping machines, and more particularly relates to a carriage for a stretch wrapping machine.
SUMMARY OF THE PRESENT INVENTIONAn aspect of the present invention is to provide a stretch wrap assembly comprising a base, a turntable mounted on the base, a column extending upwardly from the base, and a carriage vertically movable upon the column, with the carriage being configured to have stretch wrap thereon for wrapping a product on the turntable. The carriage includes a first nip roller, a first pre-stretch roller, a second pre-stretch roller, a second nip roller, a third nip roller and a fourth nip roller. The carriage is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package. The first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller. The first nip roller and the fourth nip roller can move rotationally and laterally relative to the first pre-stretch roller and the second pre-stretch roller, respectively. A center of rotation of the first nip roller is located on a first side of a line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. A center of rotation of the fourth nip roller is also located on the first side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. A center of rotation of the second nip roller is located on a second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. A center of rotation of the third nip roller is also located on the second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. The first and second sides are located on opposite sides to the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller.
Another aspect of the present invention is to provide a carriage for a stretch wrap machine comprising a housing including a first nip roller, a first pre-stretch roller, a second pre-stretch roller, a second nip roller, a third nip roller and a fourth nip roller. The carriage is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package. The first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller. The first nip roller and the fourth nip roller can move rotationally and laterally relative to the first pre-stretch roller and the second pre-stretch roller, respectively. A center of rotation of the first nip roller is located on a first side of a line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. A center of rotation of the fourth nip roller is also located on the first side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. A center of rotation of the second nip roller is located on a second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. A center of rotation of the third nip roller is also located on the second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller. The first and second sides are located on opposite sides to the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller.
Yet another aspect of the present invention is to provide a carriage for a stretch wrap machine comprising a housing having a base portion and a chassis movable relative to the base portion between an open position and a closed engaged position. The base portion includes a first pre-stretch roller and a second pre-stretch roller thereon. The chassis has a first nip roller, a second nip roller, a third nip roller and a fourth nip roller thereon. The housing, when in the closed engaged position, is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package. When the housing is in the closed engaged position, the first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller. Centers of rotation of the first nip roller and of the second nip roller move relative to the first pre-stretch roller and centers of rotation of the third nip roller and the fourth nip roller move relative to the second pre-stretch roller, respectively, by moving the housing between the open position and the closed engaged position.
Another aspect of the present invention is to provide a carriage for a stretch wrap machine comprising a housing having a base portion and a chassis movable relative to the base portion between an open position and a closed engaged position. The base portion includes a first pre-stretch roller and a second pre-stretch roller thereon. The chassis has a first nip roller, a second nip roller, a third nip roller and a fourth nip roller thereon. The housing, when in the closed engaged position, is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package. When the housing is in the closed engaged position, the first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller. A center of rotation of the first nip roller and a center of rotation of the second nip roller rotate about a first axis while the chassis moves between the open position and the closed engaged position. A center of rotation of the third nip roller and a center of rotation of the fourth nip roller rotate about a second axis while the chassis moves between the open position and the closed engaged position.
These and other aspects, objects, and features of the present invention will be understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.
For purposes of description herein, the terms “upper,” “lower,” “right,” “left,” “rear,” “front,” “vertical,” “horizontal,” and derivatives thereof shall relate to the invention as orientated in
The reference number 10 (
In the illustrated example, the carriage 18 (
The illustrated carriage 18 allows the first nip roller 25, the second nip roller 27, the third nip roller 32 and the fourth nip roller 33 to be spaced from the first pre-stretch roller 26 and the second pre-stretch roller 30 to allow the stretch wrap 20 to be threaded through the carriage 18. As illustrated in
The first nip roller 25, the second nip roller 27, the third nip roller 32, the fourth nip roller 33, the first links 41 and the second links 45 are located on a chassis to allow the first nip roller 25, the second nip roller 27, the third nip roller 32 and the fourth nip roller 33 to be moved relative to the first pre-stretch roller 26 and the second pre-stretch roller 30. However, it is contemplated that the first nip roller 25 and the second nip roller 27 could be located on individual chassis and the third nip roller 32 and the fourth nip roller 33 could be located on individual chassis to allow the first nip roller 25, the second nip roller 27, the third nip roller 32, and the fourth nip roller 33 to be moved relative to the first pre-stretch roller 26 and the second pre-stretch roller 30.
In the illustrated example, as the first pivot point 43 is moved upward along line 56 and the second pivot point 47 is moved upward along line 58, the first nip roller 25, the second nip roller 27, the third nip roller 32, the fourth nip roller 33 will return to the position in
As illustrated in
In the illustrated example, during use of the wrap machine 10 to wrap the package 24 with stretch wrap 20, the chassis 64 will be locked into position relative to the base housing 60 as illustrated in
Once the first nip roller 25 and the second nip roller 27 are moved outward as described above, the chassis 64 can be rotated about a pivot point along line 65 to allow the carriage to be loaded (threaded) as also described above in regard to
In the illustrated embodiment, it is noted that when the first nip roller 25 and the fourth nip roller 33 contact the first pre-stretch roller 26 and the second pre-stretch roller 30, respectively, the point of contact is beyond the front face of the circumference of the first pre-stretch roller 26 and the second pre-stretch roller 30 as viewed from
The above description is considered that of the one embodiment only. Modification of the invention will occur to those skilled in the art and to those who make or use the invention. For example, it is contemplated that the carriage 18 could include a pivoting arm 300 holding the dancer roller 34, with the arm 300 being biased by a spring 302 for keeping the dancer roller 34 taut against the stretch wrap 20 (see
Claims
1. A stretch wrap assembly comprising:
- a base;
- a turntable mounted on the base;
- a column extending upwardly from the base; and
- a carriage vertically movable upon the column, the carriage being configured to have stretch wrap thereon for wrapping a product on the turntable;
- the carriage including a first nip roller, a first pre-stretch roller, a second pre-stretch roller, a second nip roller, a third nip roller and a fourth nip roller;
- wherein the carriage is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package;
- wherein the first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller;
- wherein the first nip roller and the fourth nip roller can move rotationally and laterally relative to the first pre-stretch roller and the second pre-stretch roller, respectively;
- wherein a center of rotation of the first nip roller is located on a first side of a line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller;
- wherein a center of rotation of the fourth nip roller is also located on the first side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller;
- wherein a center of rotation of the second nip roller is located on a second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller;
- wherein a center of rotation of the third nip roller is also located on the second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller; and
- wherein the first and second sides are located on opposite sides to the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller.
2. The stretch wrap assembly of claim 1, wherein:
- the first pre-stretch roller and the second pre-stretch roller are configured to be rotated at different speeds in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
3. The stretch wrap assembly of claim 1, wherein:
- the carriage further includes a dancer roller, with the carriage being configured to have stretch wrap threaded around a portion of a circumference of the dancer roller and to the package.
4. The stretch wrap assembly of claim 1, wherein:
- the carriage comprises a housing having a base portion and a chassis movable relative to the base portion between an open position and a closed engaged position;
- the base portion including the first pre-stretch roller and the second pre-stretch roller thereon; and
- the chassis having the first nip roller and the second nip roller thereon.
5. The stretch wrap assembly of claim 4, wherein:
- the first nip roller and the second nip roller can move laterally relative to the first pre-stretch roller and the second pre-stretch roller, respectively, by moving the housing between the open position and the closed engaged position.
6. The stretch wrap assembly of claim 4, wherein:
- the center of rotation of the first nip roller and the center of rotation of the second nip roller rotate about a first axis while the chassis moves between the open position and the closed engaged position; and
- the center of rotation of the third nip roller and the center of rotation of the fourth nip roller rotate about a second axis while the chassis moves between the open position and the closed engaged position.
7. The stretch wrap assembly of claim 6, wherein:
- the first axis and the second axis are fixed in position relative to each other.
8. The stretch wrap assembly of claim 6, wherein:
- at least one first link connects the first nip roller to the second nip roller;
- the at least one first link having the first axis passing therethrough;
- at least one second link connects the third nip roller to the fourth nip roller; and
- the at least one second link having the second axis passing therethrough.
9. The stretch wrap assembly of claim 1, wherein:
- the first pre-stretch roller and the second pre-stretch roller have different circumferences in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
10. A carriage for a stretch wrap machine comprising:
- a housing including a first nip roller, a first pre-stretch roller, a second pre-stretch roller, a second nip roller, a third nip roller and a fourth nip roller;
- wherein the carriage is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package;
- wherein the first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller;
- wherein the first nip roller and the fourth nip roller can move rotationally and laterally relative to the first pre-stretch roller and the second pre-stretch roller, respectively;
- wherein a center of rotation of the first nip roller is located on a first side of a line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller;
- wherein a center of rotation of the fourth nip roller is also located on the first side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller;
- wherein a center of rotation of the second nip roller is located on a second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller;
- wherein a center of rotation of the third nip roller is also located on the second side of the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller; and
- wherein the first and second sides are located on opposite sides to the line drawn between the center of rotation of the first pre-stretch roller and the center of rotation of the second pre-stretch roller.
11. The carriage of claim 10, wherein:
- the first pre-stretch roller and the second pre-stretch roller are configured to be rotated at different speeds in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
12. The carriage of claim 10, wherein:
- the carriage further includes a dancer roller, with the carriage being configured to have stretch wrap threaded around a portion of a circumference of the dancer roller and to the package.
13. The carriage of claim 10, wherein:
- the housing has a base portion and a chassis movable relative to the base portion between an open position and a closed engaged position;
- the base portion includes the first pre-stretch roller and the second pre-stretch roller thereon; and
- the chassis has the first nip roller and the second nip roller thereon.
14. The carriage of claim 13, wherein:
- the first nip roller and the second nip roller can move laterally relative to the first pre-stretch roller and the second pre-stretch roller, respectively, by moving the housing between the open position and the closed engaged position.
15. The carriage of claim 13, wherein:
- the center of rotation of the first nip roller and the center of rotation of the second nip roller rotate about a first axis while the chassis moves between the open position and the closed engaged position; and
- the center of rotation of the third nip roller and the center of rotation of the fourth nip roller rotate about a second axis while the chassis moves between the open position and the closed engaged position.
16. The carriage of claim 15, wherein:
- the first axis and the second axis are fixed in position relative to each other.
17. The carriage of claim 15, wherein:
- at least one first link connects the first nip roller to the second nip roller;
- the at least one first link having the first axis passing therethrough;
- at least one second link connects the third nip roller to the fourth nip roller; and
- the at least one second link having the second axis passing therethrough.
18. The carriage of claim 8, wherein:
- the first pre-stretch roller and the second pre-stretch roller have different circumferences in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
19. A carriage for a stretch wrap machine comprising:
- a housing having a base portion and a chassis movable relative to the base portion between an open position and a closed engaged position;
- the base portion including a first pre-stretch roller and a second pre-stretch roller thereon;
- the chassis having a first nip roller, a second nip roller, a third nip roller and a fourth nip roller thereon;
- wherein the housing, when in the closed engaged position, is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package;
- wherein, when the housing is in the closed engaged position, the first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller; and
- wherein centers of rotation of the first nip roller and of the second nip roller move relative to the first pre-stretch roller and centers of rotation of the third nip roller and the fourth nip roller move relative to the second pre-stretch roller, respectively, by moving the housing between the open position and the closed engaged position.
20. The carriage of claim 19, wherein:
- the first pre-stretch roller and the second pre-stretch roller are configured to be rotated at different speeds in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
21. The carriage of claim 19, wherein:
- the chassis further includes a dancer roller, with the carriage being configured to have stretch wrap threaded around a portion of a circumference of the dancer roller and to the package.
22. The carriage of claim 19, wherein:
- the center of rotation of the first nip roller and the center of rotation of the second nip roller rotate about a first axis while the chassis moves between the open position and the closed engaged position; and
- the center of rotation of the third nip roller and the center of rotation of the fourth nip roller rotate about a second axis while the chassis moves between the open position and the closed engaged position.
23. The carriage of claim 22, wherein:
- the first axis and the second axis are fixed in position relative to each other.
24. The carriage of claim 22, wherein:
- at least one first link connects the first nip roller to the second nip roller;
- the at least one first link having the first axis passing therethrough;
- at least one second link connects the third nip roller to the fourth nip roller; and
- the at least one second link having the second axis passing therethrough.
25. The carriage of claim 19, wherein:
- the first pre-stretch roller and the second pre-stretch roller have different circumferences in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
26. A carriage for a stretch wrap machine comprising:
- a housing having a base portion and a chassis movable relative to the base portion between an open position and a closed engaged position;
- the base portion including a first pre-stretch roller and a second pre-stretch roller thereon;
- the chassis having a first nip roller, a second nip roller, a third nip roller and a fourth nip roller thereon;
- wherein the housing, when in the closed engaged position, is configured to have stretch wrap threaded through the carriage from a roll of stretch wrap, around a portion of a circumference of the first nip roller, around a portion of a circumference of the first pre-stretch roller, around a portion of a circumference of the second pre-stretch roller, around a portion of a circumference of the fourth nip roller and to the package;
- wherein, when the housing is in the closed engaged position, the first and second nip rollers are configured to maintain the stretch wrap against the first pre-stretch roller as the stretch wrap is stretched by the first pre-stretch roller, and the third and fourth nip rollers are configured to maintain the stretch wrap against the second pre-stretch roller as the stretch wrap is stretched by the second pre-stretch roller;
- wherein a center of rotation of the first nip roller and a center of rotation of the second nip roller rotate about a first axis while the chassis moves between the open position and the closed engaged position; and
- wherein a center of rotation of the third nip roller and a center of rotation of the fourth nip roller rotate about a second axis while the chassis moves between the open position and the closed engaged position.
27. The carriage of claim 26, wherein:
- the first pre-stretch roller and the second pre-stretch roller are configured to be rotated at different speeds in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
28. The carriage of claim 26, wherein:
- the first pre-stretch roller and the second pre-stretch roller have different circumferences in order to stretch the stretch wrap as it passes by the first pre-stretch roller and the second pre-stretch roller.
29. The carriage of claim 26, wherein:
- the first axis and the second axis are fixed in position relative to each other.
30. The carriage of claim 26, wherein:
- at least one first link connects the first nip roller to the second nip roller;
- the at least one first link having the first axis passing therethrough;
- at least one second link connects the third nip roller to the fourth nip roller; and
- the at least one second link having the second axis passing therethrough.
Type: Application
Filed: Sep 22, 2010
Publication Date: Mar 24, 2011
Inventors: Neil G. Cousins (Tottenham), Srbislav Z. Davidovic (Oakville)
Application Number: 12/887,867
International Classification: B65B 41/16 (20060101); B65B 11/00 (20060101);