GB2272398A - Folding apparatus for folding a hem on a sheet of material - Google Patents
Folding apparatus for folding a hem on a sheet of material Download PDFInfo
- Publication number
- GB2272398A GB2272398A GB9323151A GB9323151A GB2272398A GB 2272398 A GB2272398 A GB 2272398A GB 9323151 A GB9323151 A GB 9323151A GB 9323151 A GB9323151 A GB 9323151A GB 2272398 A GB2272398 A GB 2272398A
- Authority
- GB
- United Kingdom
- Prior art keywords
- hem
- sheet
- sheet material
- folding
- edge
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
- B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
- B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
- B29C66/83421—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types
- B29C66/83423—Roller, cylinder or drum types; Band or belt types; Ball types band or belt types cooperating bands or belts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/36—Bending and joining, e.g. for making hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
- B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
- B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
- B29C66/135—Single hemmed joints, i.e. one of the parts to be joined being hemmed in the joint area
Abstract
Hemming apparatus (1) for forming a hem (5) on a sheet (2) of heat weldable plastics material comprises a base plate (15) and a jig plate (16) which between them define a passageway (20) for the sheet (2). The jig plate (16) defines a hem forming edge (30) extending from an upstream position (31) to a downstream position (32) along which the hem (5) is progressively formed. A guide surface (36) urges the sheet (2) against the hem forming edge (30) and a hem folding member (45) forms and retains the hem (5) parallel to the sheet (2). Welding apparatus (7) forms the seam weld. <IMAGE>
Description
"Folding apparatus for folding a hem
on a sheet of material"
The present invention relates to folding apparatus for folding a hem on sheet material, the invention also relates to a method for hemming heat weldable sheet plastics material.
In the manufacture of sheet type articles from sheet plastics material, such as for example, water protective sheet type covers for garden furniture, clothes lines and the like, it is frequently necessary to form a hem around the peripheral edge of the sheet article. For example, such a hem may be required for reinforcing the edge of the article, and in particular, for reinforcing the edge of the article should it be desired to insert eyelets adjacent the peripheral edge. Additionally, a hem may be required to carry a weighting member, such as, for example, a string of steel beads for weighting the peripheral edge of the article. Hemming apparatus for forming such hems is known, in particular, in the textile industry. However, such hemming apparatus tend to be relatively complex and expensive, and furthermore, in many cases are unsuitable for use with sheet plastics material.
There is therefore a need for folding apparatus for folding a hem on sheet material. Further, there is need for a method for hemming heat weldable sheet plastics material.
The present invention is directed towards providing such a method and folding apparatus.
According to the invention there is provided folding apparatus for folding a hem on a sheet of material, the folding apparatus comprising a base plate, a jig plate comprising a sheet engaging surface for engaging the sheet material and a hem engaging surface for engaging the hem, the jig plate being spaced apart from and parallel to the base plate, and the sheet engaging surface of the jig plate defining with the base plate an elongated main passageway for the sheet material, the main passageway extending in a longitudinal direction from an upstream input through which the sheet material passes into the main passageway to a downstream output from which the sheet material exits from the main passageway, the main passageway defining an imaginary longitudinal axis, a first guide means-mounted adjacent the input to one side of the main passageway, the first guide means defining a first guide surface extending parallel to the longitudinal axis for engaging and guiding the edge of the sheet material at which the hem is to be folded into the main passageway, the jig plate defining an elongated hem forming edge about which the hem is progressively formed, the hem forming edge extending on the side of the jig plate adjacent the first guide surface in a generally downstream direction and inwardly towards the longitudinal axis, a second guide means mounted on the base plate, the second guide means defining an elongated second guide surface extending in a generally downstream direction from the first guide means, and being spaced apart from and parallel to the hem forming edge and cooperating with the hem forming edge for urging the sheet material towards the hem forming edge, and a hem folding means adjacent the output spaced apart from the hem engaging surface of the jig plate for forming and retaining the hem adjacent the hem engaging surface.
In one embodiment of the invention the transverse offset of the hem forming edge of the jig plate relative to the longitudinal axis from the upstream end to the downstream end of the hem forming edge corresponds to the width of the hem required.
In another embodiment of the invention the second guide means is longitudinally spaced apart from the first guide means and defines a transverse lead-in surface for engaging the sheet material, the lead-in surface being radiused for accommodating engagement of the sheet material adjacent the edge thereof at which the hem is to be folded.
Preferably, the second guide surface extends from the base plate.
Advantageously, the first guide surface extends between the base plate and the sheet engaging surface of the jig plate.
In one embodiment of the invention a side edge of the main passageway opposite the first and second guide surfaces is open for accommodating the sheet material.
In another embodiment of the invention the hem folding means comprises an elongated hem folding member extending transversely relative to the longitudinal axis, the hem folding member defining with the hem engaging surface of the jig plate a hem accommodating passageway.
Preferably, a third guide means is mounted in the hem accommodating passageway, the third guide means defining a third guide surface extending parallel to the longitudinal axis for engaging and guiding the edge of the hem through the hem accommodating passageway. Advantageously, the third guide surface extends between the hem engaging surface of the jig plate and the hem folding member.
In one embodiment of the invention a plurality of openings extend through the base plate for accommodating an air stream for reducing static in the sheet material. Preferably, a plurality of openings are provided in the jig plate for reducing the surface area of the jig plate in engagement with the sheet material.
Additionally, the invention provides a method for hemming a heat weldable sheet of plastics material, the method comprising the steps of folding a hem along one edge of the sheet material by passing the sheet material through the folding apparatus according to the invention, and passing the folded sheet material through heat welding apparatus for forming a longitudinally extending weld for welding the hem to the sheet material.
In one embodiment of the invention the method further comprises the step of passing air between the folding apparatus and the sheet material to reduce static in the sheet material.
Advantageously, the method further comprises the step of guiding the sheet material into the main passageway of the folding apparatus by engaging the edge of the sheet material with the first guide surface, urging portion of the sheet material adjacent the edge thereof into engagement with the hem folding edge of the jig plate by engaging the sheet material with the second guide surface, progressively folding portion of the sheet material adjacent the edge thereof around the hem forming edge and over the hem engaging surface of the jig plate to form the hem by engaging the said portion with the hem folding means.
Further the invention provides a sheet having a hem folded thereon, the hem having been folded on apparatus according to the invention.
Additionally, the invention provides a hemmed sheet of heat weldable plastics material, the hemmed sheet having been hemmed according to the method of the invention.
The invention will be more clearly understood from the following description of a preferred embodiment thereof given by way of example only with reference to the accompanying drawings, in which:
Fig. 1 is a cut-away perspective view of hemming
apparatus including folding apparatus according
to the invention for folding and hemming a heat
weldable sheet of plastics material,
Fig. 2 is a perspective view of the hemming
apparatus of Fig. 1 in use,
Fig. 3 is a perspective view of the folding
apparatus of Fig. 1,
Fig. 4 is a perspective view of the folding
apparatus of Fig. 1 in use,
Fig. 5 is a cut-away perspective view of the
folding apparatus of Fig. 1,
Fig. 6 is a plan view of the folding
apparatus of Fig. 1,
Fig. 7 is a cross-sectional end view of the
folding apparatus of Fig. 1 on the line VII - VII
of Fig. 6,
Fig. 8 is an end cross-sectional view of the
folding apparatus of Fig. 1 on the line VIII
VIII of Fig. 6,
Fig. 9 is a side elevational view of the folding
apparatus of Fig. 1,
Fig. 10 is a cross-sectional side elevational
view of the folding apparatus of Fig. 1 on the
line X - X of Fig. 6,
Fig. 11 is a perspective view of welding
apparatus for use in the hemming apparatus
of Fig. 1,
Fig. 12 is a side elevational view of the
welding apparatus of Fig. 11, and
Fig. 13 is a cross-sectional plan view of
the welding apparatus of Fig. 11 on the line
XIII - XIII of Fig. 12.
Referring to the drawings there is illustrated hemming apparatus indicated generally by the reference numeral 1 for hemming a sheet 2 heat weldable plastics material. The hemming apparatus 1 comprises folding apparatus according to the invention indicated generally by the reference numeral 3 for folding a hem 5 on the sheet 2, and heat welding apparatus indicated generally by the reference numeral 7 for seam welding the hem 5 to the sheet 2 along a continuous elongated seam weld 9. For convenience the seam weld 9 is illustrated by broken lines in Fig. 2. The folding apparatus 3 is mounted on a support bench 10, and is arranged so that the sheet 2 with the folded hem 5 passes from the folding apparatus 3 into the welding apparatus 7 which is carried on a support framework (not shown). Before describing the welding apparatus 7 in detail the folding apparatus 3 will first be described.
The folding apparatus 3 comprises a base plate 15 secured to the support bench 10 by screws (not shown) and extending sidewardly therefrom. A jig plate 16 having a sheet engaging surface 18 for engaging the sheet material 2 and a hem engaging surface 19 for engaging the hem 5 is parallel to and spaced apart from the base plate 15 and defines with the base plate 15 a main passageway 20 for the sheet 2. The main passageway 20 extends from an upstream input 22 through which the sheet 2 passes into the main passageway 20 to a downstream output 23 from which the sheet 2 with the hem 5 formed thereon is delivered from the main passageway 20 to the welding apparatus 7. The main passageway 20 defines an imaginary longitudinally extending axis 24, see Figs. 3 and 6.
One side 25 of the main passageway 20 is open along the length of the main passageway 20 for accommodating the sheet 2.
A first guide means, namely, a first guide member 27 is mounted at the opposite side of the main passageway 20 adjacent the input 22 between the jig plate 16 and the base plate 15 and spaces the jig plate 16 and base plate 15 apart from each other. The first guide member 27 defines a first guide surface 28 for engaging an edge 29 of the sheet 2 and for guiding the sheet 2 into the main passageway 20.
The jig plate 16 defines a hem forming edge 30 which extends longitudinally from the first guide surface 28 in a generally downstream direction and inwardly of the axis 24 for progressively forming the hem 5. The hem forming edge 30 extends from an upstream position 31 to a downstream position 32. The transverse offset a of the hem forming edge 30 relative to the axis 24 from the upstream position 31 to the downstream position 32 is the same as the width b of the hem 5, see Figs. 4 and 6. A second guide means, namely, a second guide member 35 is secured to the base plate 15 and defines a second guide surface 36 extending upwardly from the base plate 15, and which is spaced apart from and parallel to the hem folding edge 30 for urging the sheet 2 towards and into engagement with the hem folding edge 30 for forming the hem 5.A downstream guide plate 37 is secured to the second guide member 35 towards the downstream end thereof and defines portion of the second guide surface 36 at 38.
A downstream edge 40 of the jig plate 16 extends substantially parallel to the longitudinal axis 24 from the downstream position 32 of the hem forming edge 30 to the output 23. The second guide member 35 and downstream guide plate 37 define a further guide surface 41 which is parallel to and spaced apart from the downstream edge 40 for urging the sheet 2 into engagement with the downstream edge 40. The second guide member 35 is spaced apart from the first guide member 27 and defines a transversely extending lead-in surface 43 which engages the edge 29 of the sheet 2 passing through the main passageway 20. The lead-in surface 43 is radiused at 44 to facilitate the urging action of the second guide surface 36 urging the sheet 2 against the hem forming edge 30.
Hem folding means comprising a hem folding member 45 for folding the hem 5 over the hem engaging surface 19 of the jig plate 16 extends transversely of the folding apparatus 3 adjacent the output 23. The hem folding member 45 is secured to the downstream guide plate 37 by a spacer plate 46. The hem folding member 45 is secured to the jig plate 16 and spaced apart therefrom by a third guide means, namely, a third guide member 47 which defines with the hem folding member 45 and the hem engaging surface 19 of the jig plate 16 a hem accommodating passageway 50 for accommodating the hem 5 therethrough. The third guide member 47 defines a third guide surface 51 extending between the jig plate 16 and the hem folding member 45 which engages the edge 29 of the sheet 2 for guiding the hem 5 through the hem accommodating passageway 50.
The hem folding member 45 and third guide member 47 also act to support the downstream end of the jig plate 16 relative to the base plate 15. The plates and members forming the folding apparatus 3 are of laminated paper board sold under the trade name
PERTINEX by Mica and Micanite (Ireland) Limited of
Mallow County Cork and are secured together by an adhesive.
Openings 52 are provided in the base plate 15 for accommodating an air stream into the main passageway 20 blown by an electrically powered fan 54 mounted below the bench 10 for reducing static in the sheet 2 as the sheet 2 passes through the main passageway 20.
Openings 55 are provided in the jig plate 16 to reduce the area of the sheet engaging surface 18. and the hem engaging surface 19 which is in contact with the sheet 2, to likewise minimise static in the sheet 2.
The welding apparatus 7 comprises a support plate 60 extending upwardly from the support framework (not shown) which carries four pressure rollers 62 to 65 on spindles 66 to 69, respectively. Two endless belts 70 and 71 of teflon material around respective pairs of rollers 62 and 63, and 64 and 65 define a welding passageway 73 for accommodating portion of the sheet 2 and the hem 5 for welding thereof. The rollers 62 and 64 are fast on the corresponding spindles 66 and 68, respectively, and the spindles 66 and 68 are rotatably mounted in the support plate 60. A drive motor (not shown) mounted on the support plate 60 drives the pressure roller 62 and 64 through the spindle 66 and 68, and through a chain drive transmission (not shown). The pressure rollers 63 and 65 are idlers and are rotatably supported on the spindle 67 and 69 which are rigidly mounted in the support plate 60.
Elongated electrically powered heating elements 75 and 76 are mounted behind the belts 70 and 71 and cooperate with each other so that on passage of the sheet 2 and hem 5 through the passageway 73 the hem 5 is welded to the sheet 2 to form the longitudinal continuously extending weld 9. The pressure rollers 62 to 65 are arranged so that the sheet 2 and hem 5 are tightly gripped between the belts 70 and 71 which draw the sheet 2 and hem 5 through the weld passageway 73. Additional pressure is applied to the belts 70 and 71 by pairs of vee-belts 77 around corresponding vee-grooves 78 in the pressure roller 62 to 65. The vee-belts 77 are arranged on opposite sides of the heating elements 75 and 76.
Idling rollers 79 rotatable on spindles 80 extending from the support plate 60 carry the endless belts 70 and 71. Tensioning rollers 81 rotatable on spindles 82 tension the endless belts 70 and 71. The spindles 82 are adjustably mounted on the support plate 60 by adjustable mountings (not shown) to facilitate tensioning of the endless belts 70 and 71.
A housing 85 secured to the support plate 60 house the drive motor (not shown) and the chain drive transmission (also not shown) for driving the rollers 62 and 64.
In use, with the heating elements 75 and 76 heated to the appropriate welding temperature of the sheet 2, the sheet 2 is fed into the main passageway 20 through the input 22 with the edge 29 of the sheet 2 in engagement with the first guide surface 28. As the sheet 2 is passed through the main passageway 20 the action of the second guide surface 36 on the sheet 2 urges the sheet 2 against the hem forming edge 30 for progressively forming the hem 5. The hem folding member 45 forms the hem 5 and retains the hem 5 adjacent the hem engaging surface 19 of the jig plate 16. The sheet 2 with the hem 5 folded and lying parallel to the sheet 2 as illustrated in Figs. 2 and 4 is drawn from the output 23 of the folding apparatus 3 into the weld passageway 73 of the welding apparatus 7 by the action of the endless belts 70 and 71.The heating elements 75 and 76 form the longitudinally extending continuous seam weld 9 as the sheet 2 and the hem 5 pass through the welding passageway 73.
It is envisaged that a plurality of folding apparatus 3 may be provided for folding hems of different width b. To form hems of different width b the offset a between the upstream position 31 and the downstream position 32 is set to correspond to the desired width b of the hem.
The lateral position at which the sheet 2 with the folded hem 5 is entered into the weld passageway 73 of the welding apparatus 7 may be varied for adjusting the position of the seam weld 9 relative to the edge 29 of the sheet 2.
While the folding apparatus as been described as being of laminated paper board material, any other suitable material may be used.
While a particular construction of welding apparatus has been described, any other suitable welding apparatus may be used.
Claims (18)
1. Folding apparatus for folding a hem on a sheet of material, the folding apparatus comprising a base plate, a jig plate comprising a sheet engaging surface for engaging the sheet material and a hem engaging surface for engaging the hem, the jig plate being spaced apart from and parallel to the base plate, and the sheet engaging surface of the jig plate defining with the base plate an elongated main passageway for the sheet material, the main passageway extending in a longitudinal direction from an upstream input through which the sheet material passes into the main passageway to a downstream output from which the sheet material exits from the main passageway, the main passageway defining an imaginary longitudinal axis, a first guide means mounted adjacent the input to one side of the main passageway, the first guide means defining a first guide surface extending parallel to the longitudinal axis for engaging and guiding the edge of the sheet material at which the hem is to be folded into the main passageway, the jig plate defining an elongated hem forming edge about which the hem is progressively formed, the hem forming edge extending on the side of the jig plate adjacent the first guide surface in a generally downstream direction and inwardly towards the longitudinal axis, a second guide means mounted on the base plate, the second guide means defining an elongated second guide surface extending in a generally downstream direction from the first guide means, and being spaced apart from and parallel to the hem forming edge and cooperating with the hem forming edge for urging the sheet material towards the hem forming edge, and a hem folding means adjacent the output spaced apart from the hem engaging surface of the jig plate for forming and retaining the hem adjacent the hem engaging surface.
2. Apparatus as claimed in Claim 1 in which the transverse offset of the hem forming edge of the jig plate relative to the longitudinal axis from the upstream end to the downstream end of the hem forming edge corresponds to the width of the hem required.
3. Apparatus as claimed in Claim 1 or 2 in which the second guide means is longitudinally spaced apart from the first guide means and defines a transverse lead-in surface for engaging the sheet material, the lead-in surface being radiused for accommodating engagement of the sheet material adjacent the edge thereof at which the hem is to be folded.
4. Apparatus as claimed in any preceding claim in which the second guide surface extends from the base plate.
5. Apparatus as claimed in any preceding claim in which the first guide surface extends between the base plate and the sheet engaging surface of the jig plate.
6. Apparatus as claimed in any preceding claim in which a side edge of the main passageway opposite the first and second guide surfaces is open for accommodating the sheet material.
7. Apparatus as claimed in any preceding claim in which the hem folding means comprises an elongated hem folding member extending transversely relative to the longitudinal axis, the hem folding member defining with the hem engaging surface of the jig plate a hem accommodating passageway.
8. Apparatus as claimed in any preceding claim in which a third guide means is mounted in the hem accommodating passageway, the third guide means defining a third guide surface extending parallel to the longitudinal axis for engaging and guiding the edge of the hem through the hem accommodating passageway.
9. Apparatus as claimed in Claim 8 in which the third guide surface extends between the hem engaging surface of the jig plate and the hem folding member.
10. Apparatus as claimed in any preceding claim in which a plurality of openings extend through the base plate for accommodating an air stream for reducing static in the sheet material.
11. Apparatus as claimed in any preceding claim in which a plurality of openings are provided in the jig plate for reducing the surface area of the jig plate in engagement with the sheet material.
12. Folding apparatus for folding a hem on sheet material, the folding apparatus being substantially as described herein with reference to and as illustrated in the accompanying drawings.
13. A method for hemming a heat weldable sheet of plastics material, the method comprising the steps of folding a hem along one edge of the sheet material by passing the sheet material through the folding apparatus of any of Claims 1 to 12, and passing the folded sheet material through heat welding apparatus for forming a longitudinally extending weld for welding the hem to the sheet material.
14. A method as claimed in Claim 13 in which the method further comprises the step of passing air between the folding apparatus and the sheet material to reduce static in the sheet material.
15. A method as claimed in Claim 13 or 14 in which the method further comprises the step of guiding the sheet material into the main passageway of the folding apparatus by engaging the edge of the sheet material with the first guide surface, urging portion of the sheet material adjacent the edge thereof into engagement with the hem folding edge of the jig plate by engaging the sheet material with the second guide surface, progressively folding portion of the sheet material adjacent the edge thereof around the hem forming edge and over the hem engaging surface of the jig plate to form the hem by engaging the said portion with the hem folding means.
16. A method for hemming a heat weldable sheet of plastics material, the method being substantially as described herein with reference to and as illustrated in the accompanying drawings.
17. A sheet having a hem folded thereon, the hem having been folded on apparatus according to any of
Claims 1 to 12.
18. A hemmed sheet of heat weldable plastics material, the hemmed sheet having been hemmed according to the method of any of Claims 13 to 16.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE280492A IES922804A2 (en) | 1992-11-11 | 1992-11-11 | Folding apparatus for folding a hem on a sheet of material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9323151D0 GB9323151D0 (en) | 1994-01-05 |
| GB2272398A true GB2272398A (en) | 1994-05-18 |
Family
ID=11039797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9323151A Withdrawn GB2272398A (en) | 1992-11-11 | 1993-11-10 | Folding apparatus for folding a hem on a sheet of material |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2272398A (en) |
| IE (1) | IES922804A2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004095961A1 (en) * | 2003-04-30 | 2004-11-11 | A D Turner Limited | Hemming machine |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB131752A (en) * | 1918-09-10 | 1919-09-04 | Heyman Shapiro | Improvements in and relating to Machines for Folding Material such as Cloth into Bands of Desired Width. |
| US4448138A (en) * | 1982-07-21 | 1984-05-15 | Carl Schmale Kg | Machine for continuously folding over and stitching web edges |
| EP0437848A1 (en) * | 1990-01-16 | 1991-07-24 | Tetra Laval Holdings & Finance SA | Method for folding an edge on a continuous material web |
-
1992
- 1992-11-11 IE IE280492A patent/IES922804A2/en unknown
-
1993
- 1993-11-10 GB GB9323151A patent/GB2272398A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB131752A (en) * | 1918-09-10 | 1919-09-04 | Heyman Shapiro | Improvements in and relating to Machines for Folding Material such as Cloth into Bands of Desired Width. |
| US4448138A (en) * | 1982-07-21 | 1984-05-15 | Carl Schmale Kg | Machine for continuously folding over and stitching web edges |
| EP0437848A1 (en) * | 1990-01-16 | 1991-07-24 | Tetra Laval Holdings & Finance SA | Method for folding an edge on a continuous material web |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004095961A1 (en) * | 2003-04-30 | 2004-11-11 | A D Turner Limited | Hemming machine |
Also Published As
| Publication number | Publication date |
|---|---|
| IES58192B2 (en) | 1993-07-28 |
| GB9323151D0 (en) | 1994-01-05 |
| IES922804A2 (en) | 1993-07-28 |
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