CA2134799A1 - Tracked knife accessory for a bag making machine - Google Patents
Tracked knife accessory for a bag making machineInfo
- Publication number
- CA2134799A1 CA2134799A1 CA002134799A CA2134799A CA2134799A1 CA 2134799 A1 CA2134799 A1 CA 2134799A1 CA 002134799 A CA002134799 A CA 002134799A CA 2134799 A CA2134799 A CA 2134799A CA 2134799 A1 CA2134799 A1 CA 2134799A1
- Authority
- CA
- Canada
- Prior art keywords
- knife
- arm
- accordance
- cutting
- bag
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
- B26D7/0006—Means for guiding the cutter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/10—Making cuts of other than simple rectilinear form
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
- B26D3/00—Cutting work characterised by the nature of the cut made; Apparatus therefor
- B26D3/14—Forming notches in marginal portion of work by cutting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
- B31B70/148—Cutting-out portions from the sides of webs or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/14—Cutting, e.g. perforating, punching, slitting or trimming
- B31B70/16—Cutting webs
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Making Paper Articles (AREA)
- Auxiliary Devices For And Details Of Packaging Control (AREA)
- Nonmetal Cutting Devices (AREA)
Abstract
The guided knife film cutting apparatus uses an adjustably mounted arm to support the blade containing cutting head. The cutting head is propelled by an arm driving drive motor which will propel the blade containing knife along the guide path to effectuate complex film cutouts.
Description
:' :
213~799 TRACKED KNIFE ACCESSORY FOR A BAG MAKING MACHINE
This invention has to do with bag machines of the type that produce plastic bags from plastic film at high rates of production. The particular invention presented herein is a track guided knife that can cut segments out of a stream of bags during the continuous bag production process. The knife cuts two adjacent bags in a single pass.
More specifically, the invention presented herein is a system for holding a knife with the system comprising the invention. The system includes a track assembly and a set of cams attached to the knife holder. The cams - 2-~
will guide the knife holder along a track to facilitate cutting of the film. The knife holder is carried by a powered arm or beam that is driven by a motor to move in first one then the reverse direction.
The bag product that is made using this device is a "handle bag" and more specifically a handle part of a 20 diaper bag. Plastic diaper bags are in widespread use `
for packaging consumer quantity packages of prefolded `~
diapers often made of paper products. The prefolded diapers are compressed into generally rectangular bundles which could be difficult for a consumer to carry without 25 the handle that is often formed integral with the diaper -~ ~
bag. ~ -Such bags are produced on continuou~ly run bag machines from film let off from a stand containing a roll of film. The film may be folded, gusseted, perforated, ; 30 Ipunched and welded at various stations of the bag ; machines as is well known. One station could be used to ~ cut out the selvage adjacent the handle part of the bag.
; In the known devices this cut-out could be cut by several methods such as with a serrated knife, with a flying -knife on a belt or with a heated knife.
The serrated blade knife, which was usually a ~ punching operation did not give a nice clean cut but left ~ ~-`~ .': ~:
213~799 . ~.
213~799 TRACKED KNIFE ACCESSORY FOR A BAG MAKING MACHINE
This invention has to do with bag machines of the type that produce plastic bags from plastic film at high rates of production. The particular invention presented herein is a track guided knife that can cut segments out of a stream of bags during the continuous bag production process. The knife cuts two adjacent bags in a single pass.
More specifically, the invention presented herein is a system for holding a knife with the system comprising the invention. The system includes a track assembly and a set of cams attached to the knife holder. The cams - 2-~
will guide the knife holder along a track to facilitate cutting of the film. The knife holder is carried by a powered arm or beam that is driven by a motor to move in first one then the reverse direction.
The bag product that is made using this device is a "handle bag" and more specifically a handle part of a 20 diaper bag. Plastic diaper bags are in widespread use `
for packaging consumer quantity packages of prefolded `~
diapers often made of paper products. The prefolded diapers are compressed into generally rectangular bundles which could be difficult for a consumer to carry without 25 the handle that is often formed integral with the diaper -~ ~
bag. ~ -Such bags are produced on continuou~ly run bag machines from film let off from a stand containing a roll of film. The film may be folded, gusseted, perforated, ; 30 Ipunched and welded at various stations of the bag ; machines as is well known. One station could be used to ~ cut out the selvage adjacent the handle part of the bag.
; In the known devices this cut-out could be cut by several methods such as with a serrated knife, with a flying -knife on a belt or with a heated knife.
The serrated blade knife, which was usually a ~ punching operation did not give a nice clean cut but left ~ ~-`~ .': ~:
213~799 . ~.
-2-a rather jagged edge which is aesthetically undesirable.
Flying knife cutters are complex and to cut a shape different from the designed in shape the entire flying knife unit has to be replaced.
The system presented herein, which will cut portions of two adjacent bags at once, includes a knife mounted to a trolley or knife holder. The trolley will follow a --track which follows the path which determines the shape to be cut. The trolley is driven by a swing arm that is driven by a rotary actuator as will be explained farther on.
One advantage of this invention is that the knife cuts in both a first and a second direction allowing it to make a single stroke per machine cycle without needing a non-cutting return stroke.
This and other advantages of the invention will be apparent from reading the following specification and scanning the drawing figures of which like reference numerals identify like elements and in which Fig. 1 is a plan view of the environment of the invention in a simplified presentation;
Fig. 2 is a plan view showing more detail of the invention;
Fig. 3 is a side elevation view of the accessory mounted for production;
Fig. 4 is a partially cross sectioned portion of the knife holder and trolley taken through plane 4-4 of Fig.
Flying knife cutters are complex and to cut a shape different from the designed in shape the entire flying knife unit has to be replaced.
The system presented herein, which will cut portions of two adjacent bags at once, includes a knife mounted to a trolley or knife holder. The trolley will follow a --track which follows the path which determines the shape to be cut. The trolley is driven by a swing arm that is driven by a rotary actuator as will be explained farther on.
One advantage of this invention is that the knife cuts in both a first and a second direction allowing it to make a single stroke per machine cycle without needing a non-cutting return stroke.
This and other advantages of the invention will be apparent from reading the following specification and scanning the drawing figures of which like reference numerals identify like elements and in which Fig. 1 is a plan view of the environment of the invention in a simplified presentation;
Fig. 2 is a plan view showing more detail of the invention;
Fig. 3 is a side elevation view of the accessory mounted for production;
Fig. 4 is a partially cross sectioned portion of the knife holder and trolley taken through plane 4-4 of Fig.
3;
Fig. 5 is a partially cross sectioned portion of the knife holder and trolley of Fig. 3 in side elevation;
Fig. 6 is a view of the invention taken through plane 6-6 of Fig. 5;
Fig. 7 is an alternative embodiment of the invention;
Fig. 8 is an alterative embodiment of the invention.
Referring now to the drawing figures, one of the embodiments of the invention is shown in Fig. 1. This .~ ~ - . .
~''"''` ,~' ~, ' '':. ' ' 213~799 figure also presents the general embodiment lo of the ; ~-invention which will be fully understood by persons familiar with the construction of plastic bags on high speed continuous development bag machines.
In this figure several portions of bags are shown. -~
For instance a leading bag, which is attached at a perforation to an even earlier leading bag, is attached at a perforation or seam 20 to a trailing bag 14. For purposes of this disclosure it is convenient to treat 10 these bags as completed bags except for completion of -~
separation of the bags from each other and cutting the selvage out between the handle 16 portion of the bags.
The bags will include a body portion 24 and a bottom edge 22. The bags will move through the process travelling 15 from right to left, in this embodiment, as shown by the 3 arrow A. ;~
Item 26 is the cutter assembly and its guide system.
Visible in Fig. 1 is an arm 32 of the cutter, a knife supporting trolley 34, a track or rail guidance system 30 having guide surfaces 76 and 104 comprising a straight portion 44 between a first curved portion 42 and a second curved portion 46. Although the details of the structure will be set forth below, the cut-out 18 is formed when ~ -~
the arm 32, pivoted on pivot point 38 is swung through 25 the arc defined by the track 30. The film will be held firmly by a clamp system to assist in a clean cut. The arm will cut in both directions making one cut in each direction and then after the bag stream is indexed to the next space between handles the knife will be cycled back 30 ~the other way cutting as it goes to the rest point shown in Fig. 1.
In Fig. 1 the knife holder and guide trolley 34 is - -fixed to the end of the arm 32, which in this embodiment -is a pair of rods that are carried in the block 36 in a -35 slidable manner, and the inboard ends of the arm are variable so that the radius between the pivot point 38 and the guide trolley location 34 is adjustable as the ~
;~ ::
~ 213~799
Fig. 5 is a partially cross sectioned portion of the knife holder and trolley of Fig. 3 in side elevation;
Fig. 6 is a view of the invention taken through plane 6-6 of Fig. 5;
Fig. 7 is an alternative embodiment of the invention;
Fig. 8 is an alterative embodiment of the invention.
Referring now to the drawing figures, one of the embodiments of the invention is shown in Fig. 1. This .~ ~ - . .
~''"''` ,~' ~, ' '':. ' ' 213~799 figure also presents the general embodiment lo of the ; ~-invention which will be fully understood by persons familiar with the construction of plastic bags on high speed continuous development bag machines.
In this figure several portions of bags are shown. -~
For instance a leading bag, which is attached at a perforation to an even earlier leading bag, is attached at a perforation or seam 20 to a trailing bag 14. For purposes of this disclosure it is convenient to treat 10 these bags as completed bags except for completion of -~
separation of the bags from each other and cutting the selvage out between the handle 16 portion of the bags.
The bags will include a body portion 24 and a bottom edge 22. The bags will move through the process travelling 15 from right to left, in this embodiment, as shown by the 3 arrow A. ;~
Item 26 is the cutter assembly and its guide system.
Visible in Fig. 1 is an arm 32 of the cutter, a knife supporting trolley 34, a track or rail guidance system 30 having guide surfaces 76 and 104 comprising a straight portion 44 between a first curved portion 42 and a second curved portion 46. Although the details of the structure will be set forth below, the cut-out 18 is formed when ~ -~
the arm 32, pivoted on pivot point 38 is swung through 25 the arc defined by the track 30. The film will be held firmly by a clamp system to assist in a clean cut. The arm will cut in both directions making one cut in each direction and then after the bag stream is indexed to the next space between handles the knife will be cycled back 30 ~the other way cutting as it goes to the rest point shown in Fig. 1.
In Fig. 1 the knife holder and guide trolley 34 is - -fixed to the end of the arm 32, which in this embodiment -is a pair of rods that are carried in the block 36 in a -35 slidable manner, and the inboard ends of the arm are variable so that the radius between the pivot point 38 and the guide trolley location 34 is adjustable as the ~
;~ ::
~ 213~799
-4-trolley follows the track 30.
In Fig. 2 an alterative embodiment is presented. It is similar to the apparatus shown in Fig. 1 with the difference being that the knife holder and guide trolley 34a is not fixed to the end of the arm 32a but is variable inboard and outboard on the arm 32a while at the inboard end of the arm 32a the block 36a is fixed to the arm.
Figs. 3 and 4 set forth the details of the operative assembly set forth generally in Figs. 1 and 2. The film 66 in these views is shown between a lower clamping plate 70 and an upper guide support 74. The lower clamping plate 70, by means of clamping cylinders such as 72, will clamp the film 66 between the upper guide support 74 and itself. This will hold the film stationary so that knife 64 can clearly cut the film 66 to remove the selvage or cutout 18.
The knife 64 is provided with cutting edges 64a and 64b to enable it to cut the film in either a first or second direction as explained above. The knife 64 is held in the knife holder and guide trolley 34, which also includes attachment points for the first tubular or rod-like arm 50 and the second tubular or rod-like arm 52. A
trolley base 60 is integral with the knife holder and guide trolley 34 and provides a mounting base for the pair of cam followers 56 and 58 which are mounted for rotary movement on axles carried by the trolley base 60.
The trolley base 60 is also the direct attachment point for the knife 64. The trolley base 60 is pivotally 'mounted through pivot point 54 to the main body 48 such that the trolley base 60 can swivel independently of piece 34 which is integral with the main body 48 and held in a fixed position through its fixed attachment, in the embodiment shown in Fig. 3, to the arm 32 (comprised of the rods 52 and 50--Fig. 4).
The arm 32 is mounted through the central housing 36 in a way that allows the arm to change its effective 2I3~799 :~
..
In Fig. 2 an alterative embodiment is presented. It is similar to the apparatus shown in Fig. 1 with the difference being that the knife holder and guide trolley 34a is not fixed to the end of the arm 32a but is variable inboard and outboard on the arm 32a while at the inboard end of the arm 32a the block 36a is fixed to the arm.
Figs. 3 and 4 set forth the details of the operative assembly set forth generally in Figs. 1 and 2. The film 66 in these views is shown between a lower clamping plate 70 and an upper guide support 74. The lower clamping plate 70, by means of clamping cylinders such as 72, will clamp the film 66 between the upper guide support 74 and itself. This will hold the film stationary so that knife 64 can clearly cut the film 66 to remove the selvage or cutout 18.
The knife 64 is provided with cutting edges 64a and 64b to enable it to cut the film in either a first or second direction as explained above. The knife 64 is held in the knife holder and guide trolley 34, which also includes attachment points for the first tubular or rod-like arm 50 and the second tubular or rod-like arm 52. A
trolley base 60 is integral with the knife holder and guide trolley 34 and provides a mounting base for the pair of cam followers 56 and 58 which are mounted for rotary movement on axles carried by the trolley base 60.
The trolley base 60 is also the direct attachment point for the knife 64. The trolley base 60 is pivotally 'mounted through pivot point 54 to the main body 48 such that the trolley base 60 can swivel independently of piece 34 which is integral with the main body 48 and held in a fixed position through its fixed attachment, in the embodiment shown in Fig. 3, to the arm 32 (comprised of the rods 52 and 50--Fig. 4).
The arm 32 is mounted through the central housing 36 in a way that allows the arm to change its effective 2I3~799 :~
..
-5-radius by means of the rods 50 and 52 sliding through apertures, actually long bores in the central housing.
The central housing 36 is axially mounted by means of a central axle housing 40 pivoting on a pivot point such as 38 which acts as the axle. Looking at Fig. 1 and Fig. 3 it can be seen that the arm 32 can be urged transversely through the central housing 36 responsive to the cams 56 and 58 following the track 30. As the track goes from a curved portion 42 through the straight portion 44 and into the curved portion 46 the effective radius from the knife 64 to the axle pivot point 38 will change. The arm 32 or rods 52 and 50 moving through the central housing 36 will accommodate the radius change and let the knife follow the path dictated by the track 30.
The knife will make a first swing being driven by a rotary actuator 28 which can be an electric, air or hydraulic motor means as appropriate to swing the arm through an arc of approximately, and slightly more than -~-~
one hundred and eighty degrees, looking at Fig. 1 in a clockwise direction and cut the cut-out such as 18 from the leading bag 12 (making a trailing cutout) and from the trailing bag 14 (making the leading cutout). The ~-knife and arm will then park at a location one hundred and eighty degrees from its starting point until the next set of connected uncut bags is indexed to the zone where the selvage cutout is formed. When the next set of bags -- ~-~
is indexed the knife will make a second swing, this time in a counter clockwise direction and cut the cutout such a~ 18 from the trailing bag (making the leading cutout) ~ ~-, 30 ~and from the leading bag (making the leading cutout).
The knife and arm will then park as in Fig. 1 and await for the bags to be indexed to the perforation where the cycle will be repeated.
Fig's. 5 and 6 show an alterative embodiment of the ~` 35 invention. In this embodiment only a single rail or single upstanding wall 76 having two sides is used to -~
guide the knife 64. The track 76 has two cam followers - ~
. .
5~,~`;P~
213~ 7~9 56 and 58 on one side of the track 76. The cams 56 and 58 are attached to the trolley base 60 in a rotatable manner similar to the cams 56 and 58 of Fig. 1. However, the third cam 62 is provided on a spring loaded support 80 which pivots about pivot point (screw) 82 and is urged into engagement with the track 76 by means of spring 88.
Guide slot 84 and guide 86 contain the cam support 80.
The apparatus of the knife 64 is similar to that shown in Fig. 1 and the operation cycle is as disclosed above. The only difference is the use of three cams operating on and guided by a single track versus two cams operating between two track guides as shown in Fig. 1.
Fig. 7 shows another embodiment of the invention.
In this embodiment an arm 32b is provided with an elongated aperture 94 that allows the slot follower 96 to move inwardly and outwardly on the arm as the arm swings along the track. The slot follower 96 would project upward from the trolley and include the pair of cams 56 and 58 and the knife 64 as shown in Fig. 4. The difference here is that the trolley is not fixed to the outboard end of the arm but is free to move. The inboard end of the arm is fixed so all radius charges are accomplished by the trolley moving on the arm.
Fig. 8 shows an up close version of the device shown in Fig. 7 with a slight difference in the shape of an arm 32c. Functionally there is no difference between Fig. 7 and Fig. 8 apparatus.
The above disclosure attempts to set forth several embodiments of the invention with the preferred embodiment being the Fig. 1 embodiment. It will be apparent to one of skill in the bag machinery art that nuances of design and combinations of the embodiments set forth herein are possible. The attached claims attempt to claim these nuances of design in a scope commensurate to their breath.
The central housing 36 is axially mounted by means of a central axle housing 40 pivoting on a pivot point such as 38 which acts as the axle. Looking at Fig. 1 and Fig. 3 it can be seen that the arm 32 can be urged transversely through the central housing 36 responsive to the cams 56 and 58 following the track 30. As the track goes from a curved portion 42 through the straight portion 44 and into the curved portion 46 the effective radius from the knife 64 to the axle pivot point 38 will change. The arm 32 or rods 52 and 50 moving through the central housing 36 will accommodate the radius change and let the knife follow the path dictated by the track 30.
The knife will make a first swing being driven by a rotary actuator 28 which can be an electric, air or hydraulic motor means as appropriate to swing the arm through an arc of approximately, and slightly more than -~-~
one hundred and eighty degrees, looking at Fig. 1 in a clockwise direction and cut the cut-out such as 18 from the leading bag 12 (making a trailing cutout) and from the trailing bag 14 (making the leading cutout). The ~-knife and arm will then park at a location one hundred and eighty degrees from its starting point until the next set of connected uncut bags is indexed to the zone where the selvage cutout is formed. When the next set of bags -- ~-~
is indexed the knife will make a second swing, this time in a counter clockwise direction and cut the cutout such a~ 18 from the trailing bag (making the leading cutout) ~ ~-, 30 ~and from the leading bag (making the leading cutout).
The knife and arm will then park as in Fig. 1 and await for the bags to be indexed to the perforation where the cycle will be repeated.
Fig's. 5 and 6 show an alterative embodiment of the ~` 35 invention. In this embodiment only a single rail or single upstanding wall 76 having two sides is used to -~
guide the knife 64. The track 76 has two cam followers - ~
. .
5~,~`;P~
213~ 7~9 56 and 58 on one side of the track 76. The cams 56 and 58 are attached to the trolley base 60 in a rotatable manner similar to the cams 56 and 58 of Fig. 1. However, the third cam 62 is provided on a spring loaded support 80 which pivots about pivot point (screw) 82 and is urged into engagement with the track 76 by means of spring 88.
Guide slot 84 and guide 86 contain the cam support 80.
The apparatus of the knife 64 is similar to that shown in Fig. 1 and the operation cycle is as disclosed above. The only difference is the use of three cams operating on and guided by a single track versus two cams operating between two track guides as shown in Fig. 1.
Fig. 7 shows another embodiment of the invention.
In this embodiment an arm 32b is provided with an elongated aperture 94 that allows the slot follower 96 to move inwardly and outwardly on the arm as the arm swings along the track. The slot follower 96 would project upward from the trolley and include the pair of cams 56 and 58 and the knife 64 as shown in Fig. 4. The difference here is that the trolley is not fixed to the outboard end of the arm but is free to move. The inboard end of the arm is fixed so all radius charges are accomplished by the trolley moving on the arm.
Fig. 8 shows an up close version of the device shown in Fig. 7 with a slight difference in the shape of an arm 32c. Functionally there is no difference between Fig. 7 and Fig. 8 apparatus.
The above disclosure attempts to set forth several embodiments of the invention with the preferred embodiment being the Fig. 1 embodiment. It will be apparent to one of skill in the bag machinery art that nuances of design and combinations of the embodiments set forth herein are possible. The attached claims attempt to claim these nuances of design in a scope commensurate to their breath.
Claims (10)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A cutter assembly for use in cutting selvage from a plastic film bag while said bag is being produced, said selvage including a curved portion and a non-curved portion comprising:
clamp means to restrain said film during a cutting operation;
a rotary actuator;
a cutter arm movable by said rotary actuator through an arc of more than one hundred and eighty degrees;
a knife carrying trolley pivotally attached at an outboard end of said cutter arm;
a knife blade having, carried on said knife carrying trolley, having a cutting portion on two sides thereof allowing said knife to cut said film when said knife is moving in a first or a second direction;
guide cams carried on said knife carrying trolley;
a track for contacting said guide cams and maintaining said knife carrying trolley in a prescribed position prescribed by said track when said cutter arm is moved by said rotary actuator through said arc.
clamp means to restrain said film during a cutting operation;
a rotary actuator;
a cutter arm movable by said rotary actuator through an arc of more than one hundred and eighty degrees;
a knife carrying trolley pivotally attached at an outboard end of said cutter arm;
a knife blade having, carried on said knife carrying trolley, having a cutting portion on two sides thereof allowing said knife to cut said film when said knife is moving in a first or a second direction;
guide cams carried on said knife carrying trolley;
a track for contacting said guide cams and maintaining said knife carrying trolley in a prescribed position prescribed by said track when said cutter arm is moved by said rotary actuator through said arc.
2. The invention in accordance with Claim 1 wherein said track includes two unconnected side walls and said cams reside between said side walls of said track.
3. The invention in accordance with Claim 2 wherein said cams include a first and a second cam.
4. The invention in accordance with Claim 2 wherein said track includes a single upstanding wall and at least one of said cams contacts one of each of the sides of said upstanding wall.
5. The invention in accordance with Claim 2 wherein said cutter arm is supported on a central housing.
6. The invention in accordance with Claim 5 wherein said cutter arm is movable transversely through said central housing.
7. The invention in accordance with Claim 5 wherein said cutter arm is fixed to said central housing and said knife carrying trolley is movable transversely along said cutter arm.
8. The invention in accordance with Claim 5 wherein said cutter arm is comprised of two rods extending from said central housing to said knife carrying trolley.
9. The invention in accordance with Claim 5 wherein said cutter arm is provided with an aperture that may receive a cam of said knife carrying trolley.
10. A method of cutting selvage from a plastic bag by means of a knife carried on a knife supporting trolley, said trolley being carried at the outboard end of a cutting arm as said bag is being produced comprising the steps of:
positioning a first said plastic bag in a position to be cut;
actuating said cutting arm such that said cutting arm swings through an arc of at least one hundred and eighty degrees while said knife contacts said plastic bag to thereby cut selvage from it;
Parking said cutting arm at a position at least one hundred and eighty degrees from its starting point.
positioning a first said plastic bag in a position to be cut;
actuating said cutting arm such that said cutting arm swings through an arc of at least one hundred and eighty degrees while said knife contacts said plastic bag to thereby cut selvage from it;
Parking said cutting arm at a position at least one hundred and eighty degrees from its starting point.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14447593A | 1993-11-02 | 1993-11-02 | |
| US08/144,475 | 1993-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2134799A1 true CA2134799A1 (en) | 1995-05-03 |
Family
ID=22508759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002134799A Abandoned CA2134799A1 (en) | 1993-11-02 | 1994-11-01 | Tracked knife accessory for a bag making machine |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPH07186091A (en) |
| AU (1) | AU7752194A (en) |
| BR (1) | BR9404290A (en) |
| CA (1) | CA2134799A1 (en) |
| DE (1) | DE4438282A1 (en) |
| ES (1) | ES2110891B1 (en) |
| FR (1) | FR2711943A1 (en) |
| GB (1) | GB2283451A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU684703B3 (en) * | 1997-08-19 | 1997-12-18 | Fu-Chuan Huang | Cutting mechanism for a thermal-shrinking film labeling machine |
| AUPP587798A0 (en) | 1998-09-14 | 1998-10-08 | Anton, Con | Method of and apparatus for manufacturing complex shapes |
| DE29919595U1 (en) | 1999-11-03 | 2000-03-02 | Herz System- und Anlagentechnik GmbH, 29499 Zernien | Cutting device |
| JP2006026833A (en) * | 2004-07-20 | 2006-02-02 | Hugle Electronics Inc | Frame mounter |
| IT1394613B1 (en) * | 2009-01-21 | 2012-07-05 | Castrataro | SYSTEM AND MEANS FOR AUTOMATIC PACKAGING OF FOOD TRAYS ALSO WITH MODIFIED ATMOSPHERE. |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB583224A (en) * | 1943-10-09 | 1946-12-12 | Dunlop Rubber Co | Improvements in or relating to the cutting of rubber or the like material |
| GB1479645A (en) * | 1974-11-26 | 1977-07-13 | Paterson Prod Ltd | Paper trimmers |
| JPH06262586A (en) * | 1993-03-16 | 1994-09-20 | Karl Jimuki Kk | Paper cutting machine |
-
1994
- 1994-10-26 DE DE4438282A patent/DE4438282A1/en not_active Withdrawn
- 1994-10-27 AU AU77521/94A patent/AU7752194A/en not_active Abandoned
- 1994-10-28 ES ES09402239A patent/ES2110891B1/en not_active Expired - Lifetime
- 1994-10-31 GB GB9421979A patent/GB2283451A/en not_active Withdrawn
- 1994-10-31 BR BR9404290A patent/BR9404290A/en not_active Application Discontinuation
- 1994-11-01 CA CA002134799A patent/CA2134799A1/en not_active Abandoned
- 1994-11-02 FR FR9413072A patent/FR2711943A1/en not_active Withdrawn
- 1994-11-02 JP JP6291988A patent/JPH07186091A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07186091A (en) | 1995-07-25 |
| FR2711943A1 (en) | 1995-05-12 |
| AU7752194A (en) | 1995-05-18 |
| ES2110891R (en) | 1998-10-01 |
| DE4438282A1 (en) | 1995-05-04 |
| ES2110891A2 (en) | 1998-02-16 |
| GB9421979D0 (en) | 1994-12-21 |
| BR9404290A (en) | 1995-07-04 |
| GB2283451A (en) | 1995-05-10 |
| ES2110891B1 (en) | 1999-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |