GB2105572A - Shoe-lasting machine having a toe-wiper and a ball-wiper - Google Patents

Abstract

A shoe-lasting machine has a toe-wiper with two front plates (2, 3), and a ball-wiper with two rear plates (6, 12). In the closed position an inclined face (18, 20) on the underside of each rear plate laps over a complementary inclined face (19, 21) on the upper surface of the respective front plate. <IMAGE>

Description

SPECIFICATION Shoe-lasting machine having a toe-wiper and a ball-wiper The invention refers to a shoe-lasting machine, hereinafter referred to as of the kind described, having a toe-wiper with two front plates, and a ball-wiper with two rear plates and, possibily, two hinged-member sections provided with a supporting device, the respective front and rear plates overlapping one another in the closed position.

In the case of a known machine of this kind (DE-A-1 6 85 440) each front plate, in the zone of overlap, engages over that face of the respective rear plate which is remote from the shoe material. The overlapping sections have about the same thickness all over, which corresponds with about half the normal plate thickness. The line of separation is bounded preponderantly by faces parallel with the surface of the plate but at the two ends by endfaces standing at right angles to it. Upon sliding the front and rear plates together leather may become pinched between the endfaces next to the working face. This impairs the shaping of the lasting margin or even shears the leather. The lines of separation between adjacent hinged members lie approximately perpendicular to the working face.

Here too leather may become pinched or irregularities form on the lasting margin, which cause difficulties during later roughening. In operation the hinged member section is first of all raised and only after that is the ball-wiper closed.

The shaping of the lasting margin is impeded by this too.

The problem underlying the invention is to provide a shoe-lasting machine of the kind described, which to a greater extent than hitherto, guarantees clean shaping of the lasting margin.

This problem is solved in accordance with the invention by each rear plate lapping over that face of the respective front plate which is remote from the shoe material and the overlapping joint being bounded on both plates by oblique faces which complement one another.

Because of the oblique line of separation no danger exists that leather might be pinched or even sheared off. The oblique faces yield a satisfactory support of the upper overlapping part even where the wipers have a recess at their working face.

This recess is usual, so that the inner edge of the wiper has a thickness of at most 2 mm (otherwise the upper of the shoe must be stretched correspondingly more heavily), although for the rest a thickness of the plates of about 8 mm is necessary for rigidity. By the rear plate overlapping the front plate a greater part of the length of the lasting margin is pushed from the bail towards the toe. In this way a better drawing-in of the leather in the region of the ball results.

The oblique faces advantageously make with the surface of the plates an angle of at most 100.

The smaller the angle, the less the possibility of pinching of the leather.

For the purpose of accommodating a recess in the material-engaging working face of the plates which deepens towards the inner edge of the plates it is sufficient if the inner section of the front edge of the rear plate runs obliquely inwards to the rear. In the case of a recess rounded concavely the inner section of the front edge of the rear plate may exhibit a concave arc. This yields in the closed position of the wipers a practically continuous working face.

When the two hinged member sections are provided, the line of separation between adjacent hinged members is preferably bounded in the working zone by cylindrical surfaces concentric with the respective pivot. In the case of such cylindrical surfaces the line of separation ends at a very small angle to the working face. Impairment of the lasting margin is therefore not to be feared.

The diameter of the cylindrical surface is advantageously about the same as the greatest thickness of the hinged member. This yields the smallest angle between the line of separation and the working face.

The cylindrical surfaces are preferably convex forwards. In the case of the rotating motion during the closing of the ball-wiper the hinged-member section slides away better under the leather.

In the case of a preferred embodiment care is taken that the lifting drive for the hinged-member sections exhibit a control device which, for improved inwards thrusting of the leather, energizes the lifting drive with an overlap in time with the closing drive for the ball-wiper. In this way there results for the hinged members a combined motion which may be so set that the leather gets pushed inwards reliably in the region of the ball and the lasting margin also has a clean shape in this region.

In particular in the case of the employment of an hydraulic actuator as the lifting drive for the hinged-member sections, its control device may be adjustable. It is therefore under one's control to perform such adjustment as is best adapted to the individual shoe.

Furthermore it is favourable if the supporting devices of the hinged-member sections are supported by hinges upon the arms of a rocket with the pivot of which an actuator engages as the lifting drive. One actuator is then sufficient, even if the hinged-member sections are to be set at two different heights, the difference between which differs from shoe to shoe.

The invention is explained in greater detail below with the aid of a preferred embodiment illustrated in the accompanying drawings, in which: Figure 1 is a plan of the toe-wiper and the ballwiper in their closed position; Figure 2 is a plan of the one plate of the toewiper; Figure 3 is a side elevation from the left of the plate as Figure 2; Figure 4 is a plan of one plate and the associated hinged-member section of the ballwiper; Figure 5 is an elevation from the left of the parts as Figure 4; Figure 6 is a plan of two hinged members; Figure 7 is a side elevation from the left of these hinged members; and, Figure 8 shows an actuator having supporting devices for the hinged-member sections.

The part of the lasting machine illustrated in Figure 1 shows a toe-wiper 1 which consists of two plates 2 and 3 which can pivot about a common centre 4, and a ball-wiper 5 which exhibits on the left side a plate 6 and a section 7 having hinged members 8 to 11 and on the right side a plate 12 and a section 13 having hinged members 14 to 17. The plates 6 and 12 can pivot about centres which are not illustrated. All of the plates 2, 3, 6 and 12 are suspended in the usual way in corresponding bearer members of the lasting machine and are moved by corresponding closing drives out of a spread open position into the closed position illustrated.

In this closed position an overlapping section 1 8 of the rear plate 6 overlaps a corresponding overlapping section 1 9 of the front plate 2. In the same way an overlapping section 20 of the rear plate 1 2 overlaps a corresponding overlapping section 21 of the front plate 3.

This may be seen more clearly from Figures 2 to 5. According to these the overlapping section 20 is provided on the underside with an oblique face 22 and the overlapping section 21 is provided on the upper side with a corresponding oblique face 23. In the closed position these faces lie against one another and form a line of separation 24 which runs at an acute angle of less than 100 to the upper side 25 of the plates.

A thin line 26 indicates where the oblique face 23 starts. Furthermore the plate 3 is provided with a recess 28 starting at the thin line 27 and the plate 1 2 is provided with a recess 30 starting at the thin line 29. These recesses run approximately concave to such a way that in the region of the lines 27 and 29 there extends a plate thickness of 8 mm., whilst the free edges 31 and 32 have only a thickness of 2 mm. In the closed state there results as shown in Figure 1 a continuous recess.

The inner section 33 of the front edge of the rear plate 12 runs obliquely inwards to the rear and exhibits a concave arc so that in spite of the line of separation the continuous recess is preserved.

As shown in Figures 6 and 7 the hinged members, here the hinged members 1 5 and 16, are provided in their working zone 35 next to the inner edge 34 with hemicylindrical lines of separation 36, which arise by the one member exhibiting a hemicylindrical face 37 which is convex forwards and the other member exhibiting a corresponding concave hemicylindrical face 38.

The semicircles are concentric with apivot 39. The pivot is predetermined by a hingepin 40 which engages through the hinged member 1 6 and a projection 41 on the hinged member 1 5 which engages in it. A drilled hole 42 allows the hingepin 40 to be knocked out. This hole 42 is drilled offset eccentrically with respect to the pivot 39 so that enough space remains for the recess 30 which is not shown in the drawing of Figure 7.

Figure 8 illustrates the last hinged members 11 and 1 7 respectively supported from the arms 45 and 46 of a rocker 47, each via a respective supporting device 43 or 44 in the form of a rod provided at both ends with a hinge. The rocker hinge 48 is formed by means of a fork 49 which is fixed to a rod 50 of an hydraulic actuator 51.

Spring-loaded pins 52 and 53 which bear against the fork 49, hold the rocker 47 in its central position if no loading is exerted on the hinged members. The cylinder 54 of the actuator 51 is clamped in a bracket 55 fixed to a housing. A rule 56 serves for the prior setting of the height of the cylinder. A further bracket 57 serves as an additional guide for a rod 58 projecting downwards from the actuator 51.

A control device 60 is connected in a connecting pipe 59, which connects the actuator 51 at option to a pressure generator, e.g., a pump 61 or to a tank 62. The control device has a valve portion 63 which has a time-setting member 64.

A reference signal may be fed to an input 65. The control device 60 further has a throttle portion 66 which exhibits a throttle setting device 67. Hence it is possible to energize the actuator 51 at an adjustable time after the occurrence of the reference signal at the input 65 and at a speed predetermined by the throttle resistance which has been set. The hinged member sections 7 and 1 3 move accordingly. With this construction no difficulties arise in bringing about an overlap in time of this lifting motion with the closing motion of the ball-wiper 5, in such a way that the lasting margin gets drawn in firmly and clearly in the region of the ball.

The lasting machine described may otherwise be constructed like known lasting machines and furthermore may exercise further functions, in particular it may also be constructed as a pull-over machine.

Claims (11)

1. A shoe-lasting machine which has a toewiper with two front plates, and a ball-wiper with two rear plates; and in which, in the closed position, the respective front and rear plates overlap one another, characterised in that each rear plate laps over that face of the respective front plate which is remote from the shoe material and the overlapping joint is bounded on both plates by oblique faces which complement one another.

2. A shoe-lasting machine as in claim 1, characterised in that the oblique faces make with the surface of the plates an angle of at most 100.

3. A shoe-lasting machine as in claim 1 or claim 2, characterised in that the inner section of the front edge of the rear plate runs obliquely inwards to the rear to accommodate a recess in the lower working face of the plates which recess deepens towards the inner edge of the plates.

4. A shoe-lasting machine as in claim 3, characterised in that the recess is rounded concavely and the inner section of the front edge of the rear plate exhibits a concave arc.

5. A shoe-lasting machine as in any one of the preceding claims, characterised in that the ballwiper also has two hinged member sections provided with a supporting device.

6. A shoe-lasting machine according to claim 5, characterised in that the line of separation between adjacent hinged members is bounded in the working zone by part cylindrical surfaces concentric with the respective pivot.

7. A shoe-lasting machine as in claim 6, characterised in that the diameter of the part cylindrical surfaces is substantially the same as the greatest thickness of the hinged members.

8. A shoe-lasting machine as in claim 6 or claim 7, characterised in that the cylindrical surfaces are convex forwards.

9. A shoe-lasting machine as in any one of claims 5 to 8, charactelrised in that the lifting drive for the hinged-member sections has a control device which, for improved inwards thrusting of the leather, energizes the lifting drive with an overlap in time with the closing drive for the ball-wiper.

10. A shoe-lasting machine as in claim 9, characterised by an hydraulic actuator as the lifting drive for the hinged-member sections, a control device for the hydraulic actuator being adjustable.

11. A shoe-lasting machine as in any one of claims 5 to 10, characterised in that the supporting devices of the two hinged-member sections bear by hinges upon arms of a rocker with a pivot of which an actuator engages as the lifting drive.

1 2. A shoe-lasting machine substantially as described with reference to the accompanying drawings.