Classifications

• • 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
  • A43D23/027—Pincers
• • 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

Definitions

• This invention is concerned with a pulling over and toe lasting machine comprising a shoe support for supporting a shoe comprising a shoe upper on a last and an insole on the last bottom, a plurality of pincers, including toe and forepart pincers, arranged about the shoe support, pincer-closing means for effecting the closure of each pincer thus to cause lasting marginal portions of the upper of a shoe supported by the shoe support to be gripped by the pincers, drive means for effecting relative movement, heightwise of the bottom o , a shoe supported by the shoe support, between the shoe support and the pincers, thus to tension a shoe upper gripped as aforesaid over its last, and a wiper assembly for engaging the lasting marginal portions of the shoe upper tensioned as aforesaid and for wiping said portions inwardly over and pressing them against corresponding marginal portions of the insole.
• the inward component of movement ensures that, rather than spreading the upper outwards in relation to the last, a wrapping action of the upper about the last can be achieved, thereby giving the operator the facility of observing the position of the upper in the feather edge region thereof, and thus facilitating the adjustment of its position.
• the pincers are moved through a pre-set distance under the action of the auxiliary drive means.
• the drive means is effective to move the shoe support heightwise relative to the pincers through a pre-set distance to bring the bottom of a shoe supported by the shoe support into the plane of the wiper assembly
• the auxiliary drive means is effective to move the pincers as aforesaid to bring them to a position in which they do not impede the operation of the wiper assembly (i..e. below the wiping plane) .
• the amount of heightwise movement of the shoe support under the control of the drive means, viz.
• the tensioning of the upper about its last can be closely controlled, without the complication of calculating also the amount of tensioning which will be effected either by the movement of the pincers to the position in which they do not impede the operation of the wiper assembly or by the inwiping movement of the wiper assembly.
• each pincer is mounted for pivotal movement about an axis, the arrangement being such that, with a shoe supported by the shoe support, said axis is spaced from the edge of the shoe by a distance only slightly greater than the distance between said axis and the end of the pincer.
• the end of the pincer passes close to the edge of the shoe, thereby enhancing the "wrapping" effect of the inward movement.
• the pincer is preferably so positioned in relation to its pivotal axis that the component of inward movement is greater than that of movement heightwise of the shoe, thereby again serving to enhance the wrapping effect.
• the auxiliary drive means is fluid pressure operated and comprises a plurality of piston-and- cylinder arrangements, one associated with each pincer. In this way, the movement of each pincer takes place independently of the others, although if desired initiated by the same signal. Furthermore, the pre-set distance may vary from pincer to pincer.
• the pincers under the action of the pincer-closing means the pincers are caused to grip the shoe upper with a reduced pressure during the operation of the auxiliary drive means, and thus during the inward movement of the pincers, and thereafter with increased pressure.
• the degree of tensioning of the upper can be more closely controlled and any tendency to over-stretch the upper can be mitigated while still allowing the desired amount of relative heightwise movement between the shoe support and the pincers to take place.
• no significant amount of further tensioning of the upper will take place, other than that effected by the operator using the discretionary pull facility.
• the reduced pressure is applied to the pincer-closing means by a spring arrangement, while the increased pressure is applied by fluid pressure operated means, said latter means also acting, against the spring arrangement, to open the pincers for the insertion of the lasting marginal portions of a shoe upper therein, and of course also for:the release of the upper, at a later stage in the operating cycle.
• Fig 1. is a perspective view of a pulling over and toe lasting machine in accordance with the invention.
• Fig 2. is a fragmentary view, showing details of the mounting of one pincer of such machine, and its relationship with the shoe support thereof.
• the machine now to be described is a pulling over and toe lasting machine comprising a shoe support, in the form of a toe rest 20, and a plurality of pincers 22, comprising toe and forepart pincers, arranged in a generally U-shaped array about the shoe support.
• the machine comprises toe lasting instrumentalities including a wiper assembly comprising two wiper plates 28, a toe pad 32 and a toe band 34.
• a heel rest 36 is provided for holding the shoe in position on the toe rest 20, and also, for applying adhesive to the toe and forepart regions of the shoe bottom prior to the operation of the wiper assembly 28, a so-called imprinter plate 38 is provided, which extends about the periphery of the toe rest.
• the machine further comprises a foot switch FS, which is operator-actuated, and a control panel 26 is provided incorporating various switches for facilitating various settings of the machine.
• a support 44 is adjustably supported by the base plate 40, a clamp bolt 42 being provided for clamping the support in adjusted position.
• a column 46 which is movable heightwise by means of a piston-and-cylinder arrangement 48, mounted on the under-side of the base plate 40.
• a block 50 Carried on- the column 46 is a block 50, the upper end of which is bifurcated to form two wall portions and a base portion providing an arcuate slide surface 52.
• Received between the wall portions is a pincer body 54 having a support surface 56 shaped complementarily to the slide surface 52. In this way, the pincer body 54 can slide along the surface 52, to an extent allowed by two pin-and-slot arrangements 58.
• a piston-and-cylinder arrangement 60 is pivotally supported by the block 50 and the piston rod 62 thereof is pivotally connected to a lug 64 formed on the pincer body.
• the piston-and-cylinder arrangement 60 thus constitutes auxiliary drive means of the machine.
• the pincer body 54 supports a fixed jaw 66, on which is pivotally mounted a movable jaw 68, whereby the lasting marginal portion of an upper U inserted between the jaws can be gripped.
• a plunger 70 is provided, engageable with a rearward end of the movable jaw 68, said plunger 70 being formed integral with a piston 72 slidable in a cylindrical bore 74 formed in the pincer body 54.
• the plunger 70 has an internal bore extending lengthwise thereof in which is accommodated, one end of- a spring 76 the opposite end of which is accommodated in a sleeve 78 screwed into the floor of the bore .
• the upper end of the sleeve 78 which is accommodated within the internal bore of the plunger 70, serves to guide the plunger and at the same time retain the spring. Under the influence of the spring 76, the plunger acts on the movable jaw 68 to close it. In the end of the sleeve 78 is t readedly arranged a plug 80 whereby the pressure applied by the spring 76 can be adjusted.
• the gripping pressure applied by the jaws 66, 68 under the influence of the spring 76 is relatively low, being sufficient to cause the upper U of a shoe supported by the shoe support 20 to be laid over its last L, when heightwise relative movement is effected between the shoe support 20 and the pincers 22, but not sufficient to effect any tensioning of the upper U.
• the lower end of the cylinder 74 is connected by a line LI to a source of air under pressure, through two pilot valves PV1, PV2. In the condition shown in Fig.
• both valves are de-actuated, and thus in their "spring return" condition, whereby the lower end of the cylinder 74 is exhausted to atmosphere through valve PV1 and the upper end thereof through line L2 and the two valves PV1, PV2.
• both valves PV1, PV2 are switched, whereupon air under pressure passes therethrough to the lower end of the cylinder.
• This arrangement also enables the valves to be opened, whether for release of the upper U or for enabling the lasted marginal portions of the upper to be inserted in the pincers 22, by switching only valve PV2 from its position shown in Fig. 2, whereupon air under pressure is supplied through valve PV1 and line L2 to the upper end of the cylinder 74.
• a piston-and-cylinder arrangement generally designated 82 is provided, mounted on the base plate 40.
• a piston rod 84 of said arrangement carries the shoe support 20.
• the arrangement 82 together with the piston-and-cylinder arrangements 48 constitute drive means of the machine.
• the operator first places a shoe comprising an upper U on a last L, with an insole I on the last bottom, on the shoe support 20 and inserts the lasting marginal portions of the upper in the array of pincers 22, which are at this time held open by operation of valve PV2 as aforesaid.
• the uppermost portion of each pincer 22 lies above the wiping plane, i.e. the plane of the wiper plates 28.
• valve PV2 is released so that the pincer jaws 68 close under the force of the spring 76.
• the upper is now held under light gripping pressure.
• Air under pressure is then supplied to each piston-and-cylinder arrangement 60, whereupon each pincer 22 is caused to slide along its arcuate slide surface 52 and thus to move inwardly and downwardly in relation to the shoe.
• the centre of curvature of the slide surface 52 is indicated in Fig. 2 at A; it will be observed from Fig. 2 that the distance of the edge of the shoe from the centre of curvature A is only slightly greater than the distance of the end of the jaws 66, 68, from that centre, so that, as the pincers pivot about A, they pass close .to the edge of the last. It will of course be appreciated that the thickness of the upper U has to be taken into account in determining the position of A. Because of.
• levers 30 (Fig. 1) ; it will be appreciated that whereas only four such handles are shown in this Figure, the number of levers provided will be the same as the number of pincers, one being associated with each pincer.
• the shoe support 20 of the machine may be mounted for tilting action about an axis extending transversely of the shoe bottom whereby the toe end of a last L placed thereon is initially low in relation to the toe pincer 22 and, at the end of the tilting movement, is raised in relation to the toe pincer, further drive means (not shown) being provided for effecting such movement.
• a tilting shoe support is conventional and will not be further described herein.

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• Tyre Moulding (AREA)
• Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=10633066

Family Applications (1)

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• 1988
  • 1988-03-08 GB GB888805522A patent/GB8805522D0/en active Pending
• 1989
  • 1989-03-03 EP EP19890904101 patent/EP0364552A1/de not_active Withdrawn
  • 1989-03-03 WO PCT/GB1989/000219 patent/WO1989008412A1/en not_active Application Discontinuation

Non-Patent Citations (1)

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