EP0582027B1 - Device for stretching uppers over a last using automatically adjusted grippers - Google Patents
Device for stretching uppers over a last using automatically adjusted grippers Download PDFInfo
- Publication number
- EP0582027B1 EP0582027B1 EP19920830441 EP92830441A EP0582027B1 EP 0582027 B1 EP0582027 B1 EP 0582027B1 EP 19920830441 EP19920830441 EP 19920830441 EP 92830441 A EP92830441 A EP 92830441A EP 0582027 B1 EP0582027 B1 EP 0582027B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grippers
- last
- holders
- gripper
- rod
- 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.)
- Expired - Lifetime
Links
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Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
- A43D21/00—Lasting machines
- A43D21/16—Lasting machines with lasting pincers and toe- or heel-embracing wipers
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
- A43D119/00—Driving or controlling mechanisms of shoe machines; Frames for shoe machines
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
- A43D23/00—Single parts for pulling-over or lasting machines
- A43D23/02—Wipers; Sole-pressers; Last-supports; Pincers
Definitions
- This invention relates to footwear-making equipment, and more particularly, to a device for stretching uppers over a last preparatory to gluing the edge of the uppers to a supporting insole which has been secured under the last.
- the basic steps involved in the process consists of placing the uppers onto a last under which a supporting insole has been secured, clamping the edges of the uppers in a multiplicity of grippers mounted all around the last, stretching the uppers over the last by a relative movement of the grippers and the last, locking the uppers to the last by means of a crescent-shaped member adapted to apply a pressure to the last edge, gradually releasing the grippers from the uppers, tucking the uppers edge under the last by means of two movable shaped plates, and adhering the uppers edge to the insole using a glue which has been coated over the two parts to be joined.
- the grippers should be arranged around the last such that their clamping points, specifically the sections which border the respective clamping points, are aligned to one another a predetermined distance away from the last to follow the contour of the latter, and such that their pull is applied evenly all around the edge of the uppers.
- adjusters are usually provided which enable a gripper to be moved toward and away from the last, sideways toward and away from adjacent grippers, and rotated about its axis to evenly merge with one another the clamping points of adjacent grippers.
- a gripper generally designated 10 with its supporting and driving members.
- the gripper has a box-type body 11 which is attached by two arms 13 to a rod 12 into a four-bar linkage.
- An electric motor 14 is mounted to the body 11 for oscillation about a pivot pin 15 and is coupled to the four-bar linkage by conventional means (not shown) for the purpose to shift the gripper 10 along a substantially parallel direction to the longitudinal axis of the rod 12, upwards as viewed in the drawing.
- the gripper has two jaws 16 connected to the body 11 for pivotal movement relatively to each other, and an air-operated cylinder 17 attached to the body 11.
- the cylinder 17 is coupled to the gripper jaws by conventional means for the purpose, of which only one tie rod 19 is partly shown in the drawing figure, to operate the gripper by opening or closing its jaws 16.
- the rod 12 has an element 12a attached rigidly thereto which is constructed and functions as a chain link and is mounted to a linkage element or connecting rod 20 for pivotal movement about its longitudinal axis a-a within a cylindrical socket 21 ( Figures 3 and 4) of the connecting rod 20.
- the latter has two lugs 20a laid opposite each other into a yoke configuration and being passed through by respective coaxial bores 22 through which a pin 23 extends.
- FIG. 3 and 4 Shown schematically in Figures 3 and 4 is a supporting and driving structure for a multiplicity of grippers 10.
- the grippers nine in number, are only represented by their incomplete outlines.
- Shown in the Figures are the connecting rods 20 and chain links 12a, the latter being connected pivotally together by pins 24.
- One of the grippers, the central or apical one shown at 10a, is made narrower than the others, carries no linkage element 20, and has its rod fastened rigidly to the bed by suitable means, not shown.
- the structure comprises a rigid supporting part 25 in the form of a cylinder, with a portion of its surface removed and is fastened to the machine bed.
- this cylindrical part 25 is represented by just two wall portions. It should be understood, however, that the two portions are joined together at the top of the Figure and extended into the bottom part thereof to leave a passage for accessing the center of the structure where the last is accommodated on which the uppers would be stretched.
- the last and respective supporting and driving means have not been shown because conventional.
- the structure further comprises two thick supporting and guiding plates, shown at 26, which are also fastened rigidly to the machine bed by suitable means, not shown, and extend into the cylindrical part 25 in a common plane perpendicular to the cylinder axis, with a spacing therebetween.
- These plates 26 have notches 27 being open to the machine center and extending radially outwards. Through the thickness of the plates 26 there are provided bores 29 which extend from the bottoms of the notches 27 to the outward edges of the plates.
- Each notch 27 provides a runway for a slide 28 connected pivotally to one of the connecting rods 20 by a respective pin 23, only shown in Figure 1.
- Each slide 28 has a longitudinal threaded bore 28a ( Figure 1) into which an oppositely threaded shaft 30 engages correspondingly in helical fit relationship. The latter extends into the bore 29 between its respective slide 28 and a bearing coupling 31 mounted on the cylindrical part 25.
- the shafts 30 are each driven rotatively by a motor 33 secured on the cylindrical part 25.
- the motors 33 are operated in a co-ordinate fashion until the various grippers have been moved into a selected clamping pattern.
- this setting would be performed by an electronic control unit, known per se, so programmed as to enable a series of adjustments for moving the grippers into the best clamping pattern for a given footwear article design to be assembled.
- the position of each gripper must be known each time.
- position sensors may be employed which can be coupled either to the slides 28 or the setting motors 33 and supply each time acknowledge signals of the positions of the individual grippers to the electronic control unit, or step motors may be used whose angular settings would be known at all times.
- the device of this invention enables optimum setting of the grippers for any design, shape, and size of a footwear article to be assembled.
- the various patterns stored in the unit can be retrieved and changed as required, thereby the gripper positioning can be adjusted to fit any shapes, sizes, or sides (right or left) of footwear articles to be assembled, quite rapidly and accurately on all occasions, thus significantly expanding the machine versatility and production over prior art machines.
Landscapes
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Description
- This invention relates to footwear-making equipment, and more particularly, to a device for stretching uppers over a last preparatory to gluing the edge of the uppers to a supporting insole which has been secured under the last.
- Known are machines performing various operations for fitting the toe portion of a shoe over a last. A machine of this kind is described, along with an assembly method, in Italian Patent No. 912328, for example.
- The basic steps involved in the process consists of placing the uppers onto a last under which a supporting insole has been secured, clamping the edges of the uppers in a multiplicity of grippers mounted all around the last, stretching the uppers over the last by a relative movement of the grippers and the last, locking the uppers to the last by means of a crescent-shaped member adapted to apply a pressure to the last edge, gradually releasing the grippers from the uppers, tucking the uppers edge under the last by means of two movable shaped plates, and adhering the uppers edge to the insole using a glue which has been coated over the two parts to be joined.
- For the assembly process to be carried out correctly, the grippers should be arranged around the last such that their clamping points, specifically the sections which border the respective clamping points, are aligned to one another a predetermined distance away from the last to follow the contour of the latter, and such that their pull is applied evenly all around the edge of the uppers. Thus, for each gripper, adjusters are usually provided which enable a gripper to be moved toward and away from the last, sideways toward and away from adjacent grippers, and rotated about its axis to evenly merge with one another the clamping points of adjacent grippers.
- These adjustments are fairly critical and must be performed by qualified personnel, are time-comsuming, and adversely affect the production rate, and must be repeated on the occurrence of any change in the shoe design, which is disadvantageous especially where small volume productions are involved.
- To reduce such adjusting operations, it has been proposed of mounting the grippers in two sets, each set to a plate pivoted in the proximities of the toe end of the last, so that the distance of each set from the respective side of the last can be controlled. However, this expedient has proved only partly successful because, while enabling the gripper positions to be adjusted within limits so as to accommodate the width of a footwear article being assembled, it disallows full adaptation of the gripper clamping pattern to the last.
- It is the object of this invention to provide a device for stretching uppers over a last, which enables adjustment of the gripper positions in a ready and accurate manner for automatically adapting the clamping points thereof to the contour of a footwear article being assembled while keeping the eveness of the clamping pattern unaltered.
- This object is achieved by a device as generally defined and characterized in claim 1.
- Particular embodiments of the invention are set out in dependent claims 2 to 7.
- The invention can be more clearly understood from the following detailed description of an exemplary and in no way limitative embodiment thereof, to be read in conjunction with the accompanying drawings, in which:
- Figure 1 is a side view showing schematically a gripper of a device according to the invention;
- Figure 2 is a view of the gripper shown in Figure 1, taken in the direction of arrow F;
- Figures 3 and 4 are plan views showing schematically the most distinctive parts of a device according to the invention at two different stages of its operation; and
- Figure 5 shows in perspective the supporting members for a gripper and the associated displacement means.
- In Figures 1, 2 and 5, a gripper, generally designated 10, is shown with its supporting and driving members. In particular, the gripper has a box-
type body 11 which is attached by twoarms 13 to arod 12 into a four-bar linkage. Anelectric motor 14 is mounted to thebody 11 for oscillation about apivot pin 15 and is coupled to the four-bar linkage by conventional means (not shown) for the purpose to shift thegripper 10 along a substantially parallel direction to the longitudinal axis of therod 12, upwards as viewed in the drawing. The gripper has twojaws 16 connected to thebody 11 for pivotal movement relatively to each other, and an air-operatedcylinder 17 attached to thebody 11. Thecylinder 17 is coupled to the gripper jaws by conventional means for the purpose, of which only onetie rod 19 is partly shown in the drawing figure, to operate the gripper by opening or closing itsjaws 16. - The
rod 12 has anelement 12a attached rigidly thereto which is constructed and functions as a chain link and is mounted to a linkage element or connectingrod 20 for pivotal movement about its longitudinal axis a-a within a cylindrical socket 21 (Figures 3 and 4) of the connectingrod 20. The latter has twolugs 20a laid opposite each other into a yoke configuration and being passed through by respectivecoaxial bores 22 through which apin 23 extends. - Shown schematically in Figures 3 and 4 is a supporting and driving structure for a multiplicity of
grippers 10. For convenience of illustration in these Figures, the grippers, nine in number, are only represented by their incomplete outlines. Shown in the Figures are the connectingrods 20 andchain links 12a, the latter being connected pivotally together by pins 24. One of the grippers, the central or apical one shown at 10a, is made narrower than the others, carries nolinkage element 20, and has its rod fastened rigidly to the bed by suitable means, not shown. - The structure comprises a rigid supporting
part 25 in the form of a cylinder, with a portion of its surface removed and is fastened to the machine bed. In Figures 3 and 4, thiscylindrical part 25 is represented by just two wall portions. It should be understood, however, that the two portions are joined together at the top of the Figure and extended into the bottom part thereof to leave a passage for accessing the center of the structure where the last is accommodated on which the uppers would be stretched. The last and respective supporting and driving means have not been shown because conventional. - The structure further comprises two thick supporting and guiding plates, shown at 26, which are also fastened rigidly to the machine bed by suitable means, not shown, and extend into the
cylindrical part 25 in a common plane perpendicular to the cylinder axis, with a spacing therebetween. Theseplates 26 havenotches 27 being open to the machine center and extending radially outwards. Through the thickness of theplates 26 there are providedbores 29 which extend from the bottoms of thenotches 27 to the outward edges of the plates. - Each
notch 27 provides a runway for aslide 28 connected pivotally to one of the connectingrods 20 by arespective pin 23, only shown in Figure 1. Eachslide 28 has a longitudinal threadedbore 28a (Figure 1) into which an oppositely threadedshaft 30 engages correspondingly in helical fit relationship. The latter extends into thebore 29 between itsrespective slide 28 and abearing coupling 31 mounted on thecylindrical part 25. Theshafts 30 are each driven rotatively by amotor 33 secured on thecylindrical part 25. - For adjusting the gripper positions relative to the last, the
motors 33 are operated in a co-ordinate fashion until the various grippers have been moved into a selected clamping pattern. - Conveniently, this setting would be performed by an electronic control unit, known per se, so programmed as to enable a series of adjustments for moving the grippers into the best clamping pattern for a given footwear article design to be assembled. In this case, as skilled persons in the art of automatic setting systems will readily recognize, the position of each gripper must be known each time. For this purpose, position sensors may be employed which can be coupled either to the
slides 28 or thesetting motors 33 and supply each time acknowledge signals of the positions of the individual grippers to the electronic control unit, or step motors may be used whose angular settings would be known at all times. - As may be appreciated, the device of this invention enables optimum setting of the grippers for any design, shape, and size of a footwear article to be assembled. With the embodiment providing for an electronic program unit, the various patterns stored in the unit can be retrieved and changed as required, thereby the gripper positioning can be adjusted to fit any shapes, sizes, or sides (right or left) of footwear articles to be assembled, quite rapidly and accurately on all occasions, thus significantly expanding the machine versatility and production over prior art machines.
- While only one embodiment of this invention has been described and illustrated hereinabove, it is understood that several variants and modifications are feasible within the scope of the same inventive concept.
Claims (7)
- A device for stretching uppers over a last on a footwear-making machine, comprising:
a multiplicity of grippers (10) mounted on respective holders (12,20) around the last for clamping the uppers edges;
drive means (14,17) for the grippers (10);
means (28,30,33) for adjusting the gripper (10) positions relative to the last; and
means for effecting a relative movement of the last and the grippers along a stretching direction of the uppers over the last;
characterized in that the holders (12,20) of adjacent grippers (10) are connected pivotally together. - A device according to Claim 1, characterized in that the holders (12,20) for the grippers (10) comprise each a rod (12) and means (13) for pivotally connecting a respective one of the grippers (10) to the rod (12), that the rods (12) of the holders lie substantially parallel to one another, and that the holders (12,20) for the grippers (10) comprise, for connecting them pivotally together, each a chain link (12a) fast with its respective rod (12) and means (24) of pivotal connection between that link (12a) and the chain link (12a) of an adjacent holder.
- A device according to Claim 2, characterized in that the rods (12) of at least some of the holders (12,20) for the grippers (10) are mounted for free rotation about their longitudinal axes (a-a).
- A device according to Claim 3, characterized the means for adjusting the grippers (10) in position comprise means (28,30,33) operative to shift at least some of the holders (12,20) for the grippers (10) along a transverse direction to the pivot axes of the chain links (12a).
- A device according to Claim 4, characterized in that the means (28,30,33) for shifting the gripper (10) holders (12,20) comprise, for each gripper (10), a motor (33), a first helical coupling member (30) adapted to be rotated by the motor (33), a second helical coupling member (28) associated with the first helical coupling member, and a pivotal connection member (20) between that second helical coupling member (28) and the holder (12,20) of a respective gripper.
- A device according to Claim 5, characterized in that the second helical coupling member is a slide (28) movable along a runway (27), and the pivotal connection member is a connecting rod (20) journalled, with one end, on the slide (28) and with the other end on the gripper (10) rod (12).
- A device according to any of the preceding claims, characterized in that the position adjusting means comprise position sensors for the grippers (10) and an electronic program unit operative to adjust the gripper positions in accordance with a predetermined programmed clamping pattern.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19920830441 EP0582027B1 (en) | 1992-08-07 | 1992-08-07 | Device for stretching uppers over a last using automatically adjusted grippers |
DE1992607901 DE69207901T2 (en) | 1992-08-07 | 1992-08-07 | Device for mounting the shaft on a bar with an automatically adjusted gripper |
BR9302178A BR9302178A (en) | 1992-08-07 | 1993-06-23 | DEVICE TO EXTEND THE FLAT ON A TEMPLATE THROUGH AUTOMATIC POSITIONING PINS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP19920830441 EP0582027B1 (en) | 1992-08-07 | 1992-08-07 | Device for stretching uppers over a last using automatically adjusted grippers |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0582027A1 EP0582027A1 (en) | 1994-02-09 |
EP0582027B1 true EP0582027B1 (en) | 1996-01-24 |
Family
ID=8212158
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920830441 Expired - Lifetime EP0582027B1 (en) | 1992-08-07 | 1992-08-07 | Device for stretching uppers over a last using automatically adjusted grippers |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0582027B1 (en) |
BR (1) | BR9302178A (en) |
DE (1) | DE69207901T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1222869A1 (en) | 2001-01-16 | 2002-07-17 | OFFICINE MECCANICHE MOLINA & BIANCHI S.p.A. | Machine for preassembling and assembling an upper on a shoe-making last |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9407580D0 (en) * | 1994-04-19 | 1994-06-08 | British United Shoe Machinery | Pulling over and toe lasting machine |
EP0740514A1 (en) * | 1994-11-23 | 1996-11-06 | British United Shoe Machinery Limited | Machine for lasting heel seat and/or side portions of shoes |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB963972A (en) * | 1959-05-22 | 1964-07-15 | Wallace Gerald Hawkins | Improvements in apparatus for conforming shoe uppers |
IT1206366B (en) * | 1977-05-03 | 1989-04-21 | Cerim Spa | DEVICE SUITABLE TO COOPERATE, BY GRIPPING GRIPPERS AND AUXILIARY ACCOMPANIMENT, TO THE ASSEMBLY OF THE UPPER, IN CORRESPONDENCE OF THE QUARRY, WITH A MACHINE FOR THE MANUFACTURE OF FOOTWEAR. |
US4193154A (en) * | 1978-08-25 | 1980-03-18 | International Shoe Machine Corporation | Toe pulling over and lasting machine |
-
1992
- 1992-08-07 DE DE1992607901 patent/DE69207901T2/en not_active Expired - Fee Related
- 1992-08-07 EP EP19920830441 patent/EP0582027B1/en not_active Expired - Lifetime
-
1993
- 1993-06-23 BR BR9302178A patent/BR9302178A/en not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1222869A1 (en) | 2001-01-16 | 2002-07-17 | OFFICINE MECCANICHE MOLINA & BIANCHI S.p.A. | Machine for preassembling and assembling an upper on a shoe-making last |
Also Published As
Publication number | Publication date |
---|---|
BR9302178A (en) | 1994-02-16 |
EP0582027A1 (en) | 1994-02-09 |
DE69207901D1 (en) | 1996-03-07 |
DE69207901T2 (en) | 1996-05-30 |
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