GB2090298A - Apparatus for continuously forming a double turnover in the zone of the edges of webs of flat material - Google Patents
Apparatus for continuously forming a double turnover in the zone of the edges of webs of flat material Download PDFInfo
- Publication number
- GB2090298A GB2090298A GB8138159A GB8138159A GB2090298A GB 2090298 A GB2090298 A GB 2090298A GB 8138159 A GB8138159 A GB 8138159A GB 8138159 A GB8138159 A GB 8138159A GB 2090298 A GB2090298 A GB 2090298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- web
- folding
- rail
- over
- 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.)
- Pending
Links
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B35/00—Work-feeding or -handling elements not otherwise provided for
- D05B35/02—Work-feeding or -handling elements not otherwise provided for for facilitating seaming; Hem-turning elements; Hemmers
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
A laterally adjustable folding rail 11 has a U-shaped longitudinal edge 12. A web 10 is conveyed by a conveyor band 39 and, downstream of the position shown, by a second conveyor band engaging the underside of the folded edge. A conveyor 44, inclined to the direction of travel and rising as it advances, forms the first fold around the outside of the edge 12 and this fold is held by a guide rail 17 downstream of the conveyor 44. A second guide rail facing in the opposite direction to the rail 17 turns the edge 53 of the web 10 over the lower arm 24 of the folding rail 11 to create the second fold. The upper and lower conveyors carry the double fold through a sewing or welding station where it is fastened down. <IMAGE>
Description
SPECIFICATION
Apparatus for continuously forming a double turnover in the zone of the edges of webs of flat material
The invention relates to an apparatus for continuously forming a double turnover in the zone of the edges of webs of flat material which is subsequently secured in a processing station, for example by sewing, cementing, welding or the like, comprising folding means having curved guide surfaces for turning over the edge zone of the web of material and transport means, for example conveyor belts, which act on both sides of the web of material in order to move the edge zone of the web forward along the folding means.
The edges of webs of fabric are usually provided with double turnovers or hems by means of such arrangements and in this way are finished or rendered neat. The double turnovers or hems may moreover be formed both at the cut edges and at the longitudinal edges or selvages of a web of fabric.
In an apparatus of the known type described at the beginning, the edge zone of the web of material to be provided with a double turnover is guided by so-called folding tubes with helical guide surfaces which turn the edge zone, or the edge to be hemmed, over twice, whereupon the double turnover formed in this way is secured, for example, by a seam. Since, in this apparatus, the conveyor belts acting as conveying means are arranged laterally beside the folding tubes and are thereby also located at a lateral distance from the edge zone to be folded over on the web of material, there is a danger here that, due to the rubbing of the edge zone of the web of material in the folding tubes, the web will become distorted in the longitudinal direction.The consequence of this, in turn, is that the double turnover is not in alignment with the rear edges considered in the direction of conveyance -- of the web of material, but projects beyond it, which is highly undesirable. Moreover, with this kind of formation of a double turnover, there is easily a possibility that portions of material already remaining behind at the edge zones at the beginning of the formation of the hem by reason of the friction will form creases in the web of material, so that even the start of the treated web has a poor appearance. In the case of materials of high flexibility, the above-described drawbacks are further intensified.Finally, arrangements of the type described at the beginning are practically speaking useless when different kinds of materials are to be worked, such as, for example, linen, halflinen, towelling, cotton fabric, synthetic fabric, paper, plastics film, etc. In addition, only relatively narrow double turnovers can be produced with these known arrangements.
Moreover, there is known from German Laidopen Pending Patent Application 25 44 409 an arrangement in sewing apparatus for forming a double turnover at the edges of webs of flat material which, however, carries out the folding operations only with the web stationary. This mode of operation requires not only more working time, but also a relatively high complexity of construction, which is due to the numerous vertically and horizontally movable folding elements, the latter enclosing a conveyor belt, which makes this arrangement still more complicated.
The problem underlying the invention is to provide a structurally simple apparatus for continuously forming a double turnover in the edge zone webs of practically any flat material which avoids the formation of creases in the web of material as well as any projection of the double turnover beyond the trailing or rear edge of the web. It is moreover to be possible to combine the apparatus with different arrangements for securing the double turnover, for example sewing machines, cementing apparatus and welding equipment, which are employed according to the nature of the web of material.
According to the invention, in an apparatus of the kind described at the beginning, this problem is solved in that the folding means comprise
a folding plate or rail known per se with a
longitudinal edge bent over downwardly and
inwardly in a U-shape,
at least a first folding element extending from
the outside below the bent-over longitudinal
edge of the folding plate or rail and which turns
an edge zone of the web of material over
inwardly through an angle of 1800 at the
longitudinal edge of the folding plate or rail, and
a second folding element which follows the first
folding element in the direction of conveyance
of the web of material and, together with the
bent-over U-shaped longitudinal edge of the
folding plate or rail, turns the edge zone of the
web of material over through an angle of
another 1800 by means of a curved guide
surface, and the transport means are arranged opposite the two sides of the bent-over U-shaped longitudinal edge of the folding plate or rail and parallel to this edge and extend away from the first folding element at least as far as the processing station. As a result of this distribution and arrangement of the folding elements and transport means, the advantage is obtained that the edge zone of the web of material to be turned over twice can be so held directly on the longitudinal edge of the folding plate by the transport means that neither buckling of material and, consequently, creases in the web occur, nor does the beginning of the double turnover remain behind the leading edge of the web of material or the end of the double turnover project at the trailing edge of the web.Transport of the web of material is preferably effected by means of conveying belts and the first folding element gradually turns over the edge zone of the web of material hanging down perpendicularly at the longitudinal edge of the folding plate through a full 1 800 around the longitudinal edge of the folding plate. In the process, the edge zone of the web of material is held against the folding plate by the conveyor belt acting on the top of the web. On termination of this operation, the turned-over edge zone of the web is gripped by the lower conveyor belt and brought into working contact with the second folding element, which now again turns over the edge zone of the web already turned over once through an angle of 1 800 through another 1800, but now upwardly, in contrast to the first folding operation.After the double turnover formed in this way has left the second folding element and the folding plate, it is then clamped together by the conveying belts disposed opposite one another and, for example, delivered to a sewing station or the like, where the double turnover is secured. The running speed of the conveyor belts is adjustable.
The apparatus according to the invention is suitable for working different kinds of fabrics and materials and forms the double turnover continuously on the moving web. It is also possible, however, to design the apparatus so that it can be moved along past a stationary web of material. The apparatus is moreover very simple structurally and, depending on the nature of the web, can be combined with different securing or fixing arrangements for the double turnover, although application with automatic sewing machines is in the forefront.
According to a further development of the invention, if the first folding element consists of a shaped part which has a guide surface bent substantially in a C-shape and extending on the outside around the bent-over U-shaped longitudinal edge of the folding plate or rail in order to form a first guide space for turning over the edge zone of the web of material, the apparatus according to the invention is structurally further simplified. Moreover, the lower strand of the upper conveyor belt can be guided on the folding plate directly along its bent-over longitudinal edge.
Furthermore, according to yet another development of the invention, if, in the region of the first folding element, there is provided a conveyor belt extending below the folding plate or rail from the outside at an acute angle to the direction of conveyance of the web of material and, moreover, the upper strand of this conveyor belt extends obliquely upwards from outside and ends at a point which is located approximately abreast of the lower arm of the bent-over Ushaped longitudinal edge of the folding plate or rail, the first turning-over of the edge zone of the web of material through an angle of 1800 at the longitudinal edge of the folding plate or rail is further aided, because the obliquely extending strand of the conveyor belt takes over the downwardly projecting edge zone, a tensioning effect being exerted in addition on the web of material as a result of the special oblique arrangement or rise of the upper strand of this conveyor belt, so that even with materials with very high flexibility, for example, the formation of creases is reliably prevented.
Still another development of the invention is characterised in that the second folding element is a shaped part with a guide surface curved substantially in a C-shape and extending on the inside around the lower arm of the bent-over Ushaped longitudinal edge of the folding plate or rail into the inwardly open hollow space of this longitudinal edge in order to form a second guide space for turning over the edge zone of the web of material. By reason of this conformation and arrangement of the second folding element, the upper strand of the lower conveyor belt can be guided with advantage along the lower arm of the bent-over U-shaped longitudinal edge of the folding plate or rail. The second folding element is moreover likewise a structurally simple part.
According to yet another development of the invention, the folding plate or rail suitably has a laterally adjustable part so as to be able to form double turnovers of different widths.
For the last-mentioned purpose, it is then necessary for the first folding element to be arranged so that it is also laterally adjustable.
In order to ensure satisfactory onward transport of the edge zone of the web of material which has been turned over through an angle of 1800 at the first folding element, it is moreover appropriate for the operative part of the transport means arranged below the bent-over U-shaped longitudinal edge of the folding plate or rail to begin immediately at one end of the first folding element.
The invention is described hereinafter with reference to the drawings of an embodiment. In the drawings:
Fig. 1 is a diagrammatic side view of the apparatus according to the invention;
Fig. 2 is a plan view of the apparatus shown in
Fig. 1;
Figs. 3 to 9 are various partial sectional views on the lines 3-3 to 9-9 in Fig. 1, which illustrate diagrammatically the various stages in the formation of a double turnover at the edge zone of a web of flat material.
The apparatus shown in Figures 1 to 9 serves for continuously forming a double turnover in the zone of one selvage of a web of flat material and a similar apparatus may be provided in mirror-image arrangement for forming another double turnover at the opposite selvage of the web of material. The description of only one of these arrangements will therefore be sufficient. In the embodiment, moreover, the apparatus is arranged in advance of a sewing machine, which is not shown in detail, but from which the drive of the present apparatus is derived. Instead of a sewing machine, the apparatus may also be combined, for example, with cementing apparatus, a welding installation or the like, which depends on the nature of the web of material to be worked in a particular case.
In the present instance, the web of flat material 10 consists of a kind of fabric.
The apparatus has a folding plate 11 having a longitudinal edge 12 bent over downwardly and inwardly in a U-shape. The folding plate 11 is fixed to a frame member 140 of the apparatus by means of angle pieces 13. On the folding plate 11 there is arranged a laterally adjustable plateshaped part 14 which has a longitudinal edge 12' likewise bent over downwardly and inwardly in a
U-shape and embracing the longitudinal edge 12 of the folding plate 11 in the inner position of the said edge of the part 14. The purpose of this laterally adjustable part 1 4 consists in providing a possibility for enabling double turnovers of different widths to be formed with the apparatus, the width adjustment being intended to be effected in an infinitely variable manner.For this reason, slots 1 5 are formed in the horizontal sides of the angle pieces 13 and in the folding plate 11 and the fixing screws 1 6 for the plate-shaped part 14 extend through these slots.
In the region of that end of the folding plate 11 which, observed in the direction of conveyance (marked by an arrow in Figures 1 and 2) of the web of material 10, is located at the front, a first folding element 1 7 is arranged opposite the bentover longitudinal edges 12 and 12' of the folding plate and the adjustable part 14, respectively, to be adjustable transversely with respect to the direction of conveyance of the web of material 10.
In the embodiment, this first folding element 1 7 consists of a shaped part of sheet metal which has a guide surface 1 8 bent substantially in a C-shape.
This guide surface 1 8 extends around the bentover U-shaped longitudinal edges 12 and 12' of the folding plate 11 and the part 14, respectively, and forms with the latter a first guide space 1 9 for turning over the edge zone of the web of material 10 through an angle of 1 800. Similarly to the part 14, the first folding element 17 is fixed to angle pieces 180 to be adjustable transversely of the direction of conveyance of the web of material 10, the angle pieces being fixed in turn to a frame member 140a of the apparatus. In the horizontal side of these angle pieces 180 there is provided a slot 1 9 through which a fixing screw 20 for the first folding element 1 7 extends.
A second folding element 21 is fixed by means of screws 22 to the underside of the folding plate 11 behind the first folding element 1 7 in the direction of conveyance of the web of material 1 0.
This second folding element 21 is likewise a shaped part made, for example, of sheet metal, with a guide surface 23 (Figs. 6 to 8) curved substantially in a C-shape and extending from below the lower arm 24 of the longitudinal edges 12, 12' of the folding plate 11 and the part 14, respectively, (according to the position of adjustment of the latter), around this arm 24 into the inwardly open hollow space of the longitudinal edge 12, whereby a second guide space 25 for turning over the edge zone of the web of material 10 through an angle of another 1800 is formed.
Two transport means 26 and 27 which produce the advance of the web of material 10 in the direction of the arrow are provided at the edge zone of the web 10. These transport means 26 and 27 consist in the embodiment of conveyor belts which run over pulleys 28, 29 and 30, 31, respectively. The pulleys 28 and 30 are mounted to be freely rotatable on axles 32, which in turn are fixed in the frame member 1 40a of the apparatus. The pulleys 29 and 31 are driving pulleys and are therefore fixed on shafts 34 and 35, respectively, which in turn are mounted in the frame member 1 40a of the apparatus so that they are rotationally movable therein.Moreover, on the shafts 34 and 35 there are fixed toothed wheels 36 and 37, respectively, over which run toothed belts 38 which are driven by a motor (not shown) which may be a part of a sewing machine 60 arranged after the apparatus according to the invention and partially indicated in Fig. 1 in chaindotted lines. The position, length and width of the upper conveyor belt or transport means 26 are so chosen that its lower strand 39 extends above the bent-over longitudinal edges 12, 12' of the folding plate 11 and the part 14, respectively, and in fact starting from a point opposite the folding element 1 7 at which the turning over of the edge zone of the web of material 10 by the folding element 17 commences. In the embodiment, the strand 39 ends at a point located behind the sewing station, which is indicated at 40 in Figs. 1 and 2.At this sewing station 40, the finished double turnover 52 is secured by a seam (see also Fig. 9).
The lower conveyor belt or transport means 27 is so arranged and dimensioned that the operative part of its upper strand 41 extends opposite the lower arm 24 of the bent-over longitudinal edges 12, 12' of the folding plate 11 and the part 14, respectively, and in fact beginning at a point immediately after the rear end of the first folding device 17, as seen in the direction of conveyance of the web of material 10. The strand 41 ends in the same vertical plane as the lower strand 39 of the upper conveyor belt. The reference 42 indicates guide rollers for the conveyor belts which are mounted on spindles 43 fixed in turn in the frame member 140a.The reference 61 indicates a pulley for the lower conveyor belt which marks the beginning of the operative part of the upper strand 41 and is mounted to be freely rotatable on a spindle 62 fixed in the frame member 140a.
Furthermore, in the region of the first folding element 1 7 there is provided a conveyor belt 44 which extends below the folding plate 11 from outside at an acute angle with respect to the direction of conveyance of the web of material 0.
The conveyor belt 44 is stretched around a driving pulley 45 and around a freely rotating pulley 46.
The driving pulley 45 is fixed on a shaft 48 driven by an electric motor 50. The pulley 46 is fixed on a shaft 49 (Fig. 2). The shafts 48 and 49 are mounted to be rotationally movable in a frame member 140c. It is apparent from Figures 1 and 3 to 5 that the upper strand 51 of the conveyor belt 44 extends obliquely upwards from outside, that is from the driving pulley 45, to a height which corresponds approximately to that of the lower arm 24 of the bent-over longitudinal edge 12 of the folding plate 11. The highest point of the upper strand 51 of the conveyor belt 44 is consequently determined by the position and the diameter of the pulley 46. It is also apparent from
Fig. 2 and Figs. 3 and 5 that this position is located laterally beside the inner longitudinal edges of the arm 24 and the folding element 17.
The apparatus operates in the following manner:
The plate-shaped part 14 and the first folding element 1 7 are so adjusted transversely of the direction of conveyance of the web of material 10 that a portion 53 or 53', as the case may be, of the web 10 of sufficient size for forming a double turnover 52 (Fig. 9), according to the width of the desired turnover, first hangs down perpendicularly when the web 10 is placed on the folding plate 11 in front of the first folding element 1 7. When the motor (not shown) driving the conveyor belts or transport means 26 and 27 and the motor 50 are then switched on and, moreover, the web of material 10 is brought into engagement with the lower strand 39 of the upper conveyor belt, the web 10 is moved forward in the direction of the arrow.In the process, the downward hanging portion 53 or 53' comes into abutment with the curved C-shaped guide surface 1 8 of the first folding element 17 and is gradually turned over inwardly through an angle of 1 800 about the longitudinal edge 12' of the part 14 (Figs. 3 to 5).
This initial turning-over of the edge zone of the web of material 10 is aided by the upper strand 51 of the conveyor belt 44, which carries the portion 53 or 53' inward obliquely and in addition exerts
a tensioning effect on it, so that the formation of
creases, particularly in very flexible material, is
prevented. In the further course of the advance of the web 10, the edge 54 of the web 10 projecting from the guide space 19 (Figs. 5 and 6) is then engaged by the second folding element 21 of its curved C-shaped guide surface 23 and gradually turned over through a further angle of 1 800 around the inner longitudinal edge of the arm 24 into the guide space 25, the edge zone of the web of material 10 being gripped in this stage both by the lower strand 39 and by the upper strand 41 of the two conveying belts.In other words, even before the edge zone 54 is turned over and arrives in the guide space 25, the upper strand 41 of the lower conveying belt has already been brought into engagement with the web of material 1 0. The result is that in this stage the edge zone of the web of material 10 is so held clamped between the conveyor belts that all buckling of material or crease formation due to friction of the web 10 with the folding elements 17 and 21 is prevented.
It is emphasized that as a rule the edge zone 54 is narrow, although even with a fairly great width any distortion of this edge zone does not occur during the movement of the web of material 10.
When the now already finished double turnover leaves the second folding element 21, it is delivered, compressed by the lower strand 39 and the upper strand 41 of the two conveying belts (Fig. 9), to the sewing station 40, which sews the double turnover 52 together at the inwardly disposed seaming edge.
It is indicated in chain-dotted lines in Figs. 3 to 9 that by suitable lateral adjustment of the plateshaped part 14 relative to the folding plate 11 double turnovers 52 of different widths can be produced together with the latter. In Fig. 9, for example, a relatively wide double turnover is indicated in chain-dotted lines and a relatively narrow double turnover is indicated in solid lines.
If, on the other hand, only double turnovers of predetermined width are required, the plateshaped part 14 may also be dispensed with. In each case, however, the (second) turning-over of the edge zone 54 is carried out in cooperation with the lower arm 24 of the longitudinal edge 12 of the folding plate 11 and with the second folding element 21.
Claims (7)
1. Apparatus for continuously forming a double turnover in the zone of the edges of webs of flat material which is subsequently secured in a processing station, for example by sewing, cementing, welding or the like, comprising folding means having curved guide surfaces for turning over the edge zone of the web of material and transport means, for example conveyor belts, which act on both sides of the web of material in order to move the edge zone of the web forward along the folding means, characterised in that the folding means comprise
a folding plate or rail (11) known per sue with a
longitudinal edge (12) bent over downwardly
and inwardly.in a U-shape,
at least a first folding element (1 7) extending
from the outside below the bent-over longitudinal
edge (12) of the folding plate (11) or rail and
which turns an edge zone (53) of the web of
material (10) over inwardly through an angle of
1800 at the longitudinal edge (12) of the
folding plate (11) or rail, and
a second folding element (21) which follows
the first folding element (17) in the direction of
conveyance of the web of material (10) and,
together with the bent-over U-shaped
longitudinal edge (12) of the folding plate (11)
or rail, turns the edge zone (54) of the web of
material (10) through an angle of another 1800 by means of a curved guide surface (23), and the transport means (26, 27) are arranged opposite the two sides of the bent-over longitudinal edge (12) of the folding plate (11) or rail and parallel to this edge and extend away from the first folding element (17) at least as far as the processing station (40).
2. Apparatus according to claim 1, characterised in that the first folding element (1 7) consists of a shaped part which has a guide surface (18) bent substantially in a C-shape and extending on the outside around the bent-over Ushaped longitudinal edge (12) of the folding plate (11) or rail in order to form a first guide space (19) for turning over the edge zone (53) of the web of material 0).
3. Apparatus according to claim 1 or 2, characterised in that in the region of the first folding element (17) there is provided a conveyor belt (44) extending below the folding plate (11) or rail from the outside at an acute angle to the direction of conveyance of the web of material (10) and the upper strand (51) of this conveyor belt (44) extends obliquely upwards from outside and ends at a point which is located approximately abreast of the lower arm (24) of the bent-over Ushaped longitudinal edge (12) of the folding plate (11) or rail.
4. Apparatus according to claim 1, characterised in that the second folding element (21) is a shaped part with a guide surface (23) curved substantially in a C-shape and extending on the inside around the lower arm (24) of the bent-over U-shaped longitudinal edge (1 2) of the folding plate (11) or rail into the inwardly open hollow space of this longitudinal edge (12) in order to form a second guide space (25) for turning over the edge zone (54) of the web of material (10).
5. Apparatus according to claim 1, characterised in that the folding plate (11) or rail has a laterally adjustable part (14) so as to be able to form double turnovers (52) of different widths.
6. Apparatus according to claim 2, characterised in that the first folding element (17) is arranged to be laterally adjustable.
7. Apparatus according to claim 1, characterised in that the operative part (41) of the transport means (27) arranged below the bentover U-shaped longitudinal edge (12) of the folding plate (11) or rail begins immediately at one end of the first folding element (1 7).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19803047972 DE3047972C2 (en) | 1980-12-19 | 1980-12-19 | Device for continuously forming a double envelope in the area of the edges of at least one flat material web |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2090298A true GB2090298A (en) | 1982-07-07 |
Family
ID=6119656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8138159A Pending GB2090298A (en) | 1980-12-19 | 1981-12-17 | Apparatus for continuously forming a double turnover in the zone of the edges of webs of flat material |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE3047972C2 (en) |
| FR (1) | FR2496721A1 (en) |
| GB (1) | GB2090298A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0096018A1 (en) * | 1982-05-27 | 1983-12-07 | Akab Of Sweden Ab | Hemmer |
| US4580512A (en) * | 1983-11-16 | 1986-04-08 | Nakanihon Juki Co., Ltd. | Method of and apparatus for feeding fabric to a sewing machine |
| US4653414A (en) * | 1985-04-30 | 1987-03-31 | Levi Strauss & Co. | Apparatus for feeding fabric parts to sew a felled seam |
| US4924787A (en) * | 1989-03-03 | 1990-05-15 | The Charles Stark Draper Laboratory, Inc. | Apparatus for forming a seam |
| US4941417A (en) * | 1989-03-03 | 1990-07-17 | The Charles Stark Draper Laboratory, Inc. | Full felled seam fold assembly |
| US5031552A (en) * | 1990-05-10 | 1991-07-16 | The Charles Stark Draper Laboratory, Inc. | Drive assembly for seam-forming apparatus |
| CN106521827A (en) * | 2016-12-29 | 2017-03-22 | 杰克缝纫机股份有限公司 | Sewing equipment and sewing method of ring-shaped folded edges |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3332213A1 (en) * | 1983-09-07 | 1985-03-21 | Union Special Corp., Chicago, Ill. | Method and device for producing shirt sleeves from a sleeve blank |
| US5993403A (en) * | 1993-05-20 | 1999-11-30 | Ambu International A/S | Adjustable cervical collar |
| US5520619A (en) * | 1993-05-20 | 1996-05-28 | Ambu International A/S | Adjustable cervical collar |
| US5704304A (en) * | 1994-05-27 | 1998-01-06 | Burton & Noonan | Level lining apparatus and method |
| US5893204A (en) | 1996-11-12 | 1999-04-13 | Dresser Industries, Inc. | Production process for casting steel-bodied bits |
| US5572940A (en) * | 1994-05-27 | 1996-11-12 | Burton & Noonan | Folding and sewing apparatus |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB127120A (en) * | 1918-06-05 | 1919-05-29 | Harry Francis Ainley | Improvements in and relating to Work Feeding, Folding and Guiding Devices for use on Sewing Machines. |
| US2738746A (en) * | 1952-06-04 | 1956-03-20 | Fieldcrest Mills Inc | Apparatus for making bed sheets and the like |
| US3481292A (en) * | 1968-03-22 | 1969-12-02 | Cluett Peabody & Co Inc | Hemming device |
| US3486470A (en) * | 1968-10-04 | 1969-12-30 | Singer Co | Fabric folding unit |
| GB1376798A (en) * | 1971-12-29 | 1974-12-11 | Burton P E | Method and apparatus for folding and sewing hems |
| JPS49121641A (en) * | 1973-03-29 | 1974-11-20 | ||
| US4066025A (en) * | 1975-08-04 | 1978-01-03 | Billy Logan Speer | Hem folding machine |
| DE2544409C3 (en) * | 1975-10-03 | 1979-05-10 | Conrad 8741 Saal Arbter | Device on sewing systems for forming a double envelope on the cut edges of flat webs of material |
-
1980
- 1980-12-19 DE DE19803047972 patent/DE3047972C2/en not_active Expired
-
1981
- 1981-12-15 FR FR8123436A patent/FR2496721A1/en active Pending
- 1981-12-17 GB GB8138159A patent/GB2090298A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0096018A1 (en) * | 1982-05-27 | 1983-12-07 | Akab Of Sweden Ab | Hemmer |
| US4580512A (en) * | 1983-11-16 | 1986-04-08 | Nakanihon Juki Co., Ltd. | Method of and apparatus for feeding fabric to a sewing machine |
| US4653414A (en) * | 1985-04-30 | 1987-03-31 | Levi Strauss & Co. | Apparatus for feeding fabric parts to sew a felled seam |
| US4924787A (en) * | 1989-03-03 | 1990-05-15 | The Charles Stark Draper Laboratory, Inc. | Apparatus for forming a seam |
| US4941417A (en) * | 1989-03-03 | 1990-07-17 | The Charles Stark Draper Laboratory, Inc. | Full felled seam fold assembly |
| WO1990010105A1 (en) * | 1989-03-03 | 1990-09-07 | The Charles Stark Draper Laboratory, Inc. | Full felled seam fold assembly |
| WO1990010745A1 (en) * | 1989-03-03 | 1990-09-20 | The Charles Stark Draper Laboratory, Inc. | Apparatus for forming a seam |
| US5031552A (en) * | 1990-05-10 | 1991-07-16 | The Charles Stark Draper Laboratory, Inc. | Drive assembly for seam-forming apparatus |
| CN106521827A (en) * | 2016-12-29 | 2017-03-22 | 杰克缝纫机股份有限公司 | Sewing equipment and sewing method of ring-shaped folded edges |
| CN106521827B (en) * | 2016-12-29 | 2019-05-31 | 杰克缝纫机股份有限公司 | The sewing device and method of sewing of collar extension flanging |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3047972A1 (en) | 1982-07-01 |
| DE3047972C2 (en) | 1986-02-20 |
| FR2496721A1 (en) | 1982-06-25 |
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