|Publication number||US1610031 A|
|Publication date||Dec 7, 1926|
|Filing date||Feb 28, 1924|
|Priority date||Apr 10, 1923|
|Publication number||US 1610031 A, US 1610031A, US-A-1610031, US1610031 A, US1610031A|
|Inventors||Townsend Backhouse Headley|
|Original Assignee||Townsend Backhouse Headley|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (2), Classifications (5)|
|External Links: USPTO, USPTO Assignment, Espacenet|
H. T. BACKHOUSE SHEET FEEDING DEVICE V Filed Feb. 28, 1924 2 Sheets-Sheet 2 Ti" 5 TAT ES Param ortica.
EEADLEY TOWNSEND OF LONON, ENGLAND.
Application filed February 8, 1924. Serial No. 695,865,` and vintl-reet Britain-April l0, 1923.
. sheet is-arrested by two or more registering marks.
stops usually termed the front la-ys or lay The front lays `insure that each sheet is brought into the same position, as regards the-alignment of its forward edge, before being passed on to the printing or like machine.
It is desirable, particularly with modern requirements of high-speed output from sheet-feeding apparatus, that the initial travel of the sheet vfrom the sheet pile towards the front lays should be comparatively rapid but that the sheet should be slowed up immediately before it reaches the front lays so that it will not rebound therefrom. The present invention is concerned with vmeans for controlling the speed at which the sheets are conveyed by the feeding apparatus so that the above requirements will be fulfilled.
rilhis invention provides in combination with sheet-feeding apparatus fora printing press or other machine operating on paper or like sheets, variable speed driving mechanism for the sheet-feeding means, comprising two cranks or equivalent devices of unequal lengths, one constituting the driving member and the other the driven member of the mechanism, saidrcranks being rotatable about parallel axes located as specified hereunder and being coupled by a pin, stud or other projection from the smaller crank in engagement with a radially or substantially radially directed slot or guide in or on the larger crank.
The location of the axes of the two cranks is such that the circle of revolution of the smaller crank, when projected on to the plane of rotation of the larger crank, will lie within the circle of revolution of said larger crank. This arrangement insures that, durinc' the rotation of the cranks about vtheir respective axes, one being rotated by the other, thc pin on the smaller crank will at all times remain in engagement with the guide on the larger crank. Variable speed mechanism of this general type has hitherto been proposed for purposes other than that with whichthe present invention is concerned, and no claim is made herein to this mechanism per se.
ln one form of the present invention each of the twov cranks aforesaid is constituted by .a disc carrying at its periphery, or having .its peripheryV formed as, a toothed ring for the transmission of the drive to and from the mechanism.
One example of this invention will now be described with reference to the accompanying drawings, in whichvFigure 1 isa cross-section through a variable speed gear-box embodying the invention;
Figures 2 and 3 the operation of the mechanism;
Figure 4i is a similar diagram showing a` modification in the disposition of the guide on the larger crank;
Figure 5 is a diagram similar to-Figure 4 and illustrating ya possible modification in the shape of the guide.
Like reference numerals indicate like parts in the various figures.
The arrangement shown in Figures 1 2 and 3 will first be described. The two cranks are constituted by disc members 10 and 11, the former corresponding to the larger crank and the latter to the smaller crank. The discs 10 and 11 are formed integrally with or are secured toshafts l2 and 13 which are mounted for rotation in bearings .14, 15 carried in a gear-box or housing'16. The two discs 10, 1l are unequal in diameter and are mounted face to face with their axes of rotation parallel. The discs are so placed that there is one point in the periphery of cach at which the edges of the discs are in line with each other-that is, considered in a direction along the laxes of the discs. In Figure 1 the position of alignment is at the right-hand side of the discs. Secured to the smaller disc 11 near the periphery thereof is a stud 17 which extends towards the disc 10 in a direction parallel with the axis thereof. Cut substantially radially across the face of the disc 10 is a slot 18 within which engages the outer end of the stud 17. This end of the stud is fitted with an anti-friction are diagrams illustratingr roller 1S) of such size that a slight clearance left between the periphery of the roller and the side walls of the slot.
The disc 10 is formed with a bevel gear 20 which meshes vwith a co-operat-ing gearuvheel 21 carried by a shaft 22, constituting the main driving or input shaft of the mecha nism. The disc 11 is driven by the pin-andslot connection aforesaid from the disc 10. Rotation of the disc 11 is transmitted to a sleeve 25 through meshing gears 23 and 2li formed respectively on the rim of the disc 11 and on the sleeve. From the sleeve 25 the drive passes through meshing gears 26 and 27 to a shaft 28 Which constitutes the driven or output shaft of the mechanism.
ln operation the shaft 22, and therefore also the disc lO, is driven at constant angular speed. lllhen the discs are in the position shown in Figure 2 the stud 17 is at the limit of its travel towards one end. of the slot 18. llvlhen in this position the part of the slot 18 which engages the roller 19, that is the part of the disc 10 which transmits motion to the disc 11 is at a maximum operative distance from the centre of rotation of the disc 10 and is therefore rotating at a maximum peripheral speed. Under these conditions the angular speed of the smaller disc 11 and therefore oi the output shaft 28 is a maximum. llhcn the disk l0 has moved through a portion of a revolution the slot 18 and the stud l? assume the position shovvn in Figure 8. is Will be seen the roller 19 has shifted radially inwards along the slot and the peripheral speed of the driving portion of the disc l0 has now been considerably reduced. rihe angular' velocity imparted to the disc 11 and therefore to the output shaft, is consequently also reduced. lt is at this period that the slowing up of the sheetsfeeding means taires place.
Various modifications may be made in the shape and disposition of the slot in the disc member l() in order to vary the rate at which the speed of the final drive changes. The disposition of the slot is not necessarily strictly radial although it Will always be in a general direction from the periphery towards the centre about which the disc 10 rotates. For example the slot could be located slightly to one side of the centre as shown in Figure 4:, or again the slot may be curved its ends as illustrated in Figure 5.
it is to be understood that the direction in which the drive is transmitted through the mechanism may be reversed, that is to say, the shaft 28 may be the driving member and the snaft 22- the driven member. Under these conditions the smaller disc rotated at con stant angular velocity and the variable speed is obtained from the larger disc. ln place of the disc members described herein cranks or equivalent devices may obviously,v be em pl yed. Again instead of a slot out in the face of the disc 10 the latter may be formed with upstanding ribs constituting a guide to engage the roller 19.
1 claim 1. The combination with sheet feeding apparatus of the band-conveyor type of variable speed driving mechanism for the conveyor bands, said mechanism comprising in combination tivo disc-members unequal in diameter and mounted face to face for rotation about parallel axes, one disc-member constitilting` the 'drive and the other the driven member of the mechanism, a slot extending across the face of the larger' disc and having allel axes, one disc constituting the drivingy member and the other the driven member of the mechanism, a substantially diametral slot in the face of the larger dise, a projection extending from the face of the smaller disc into engagement With the slot aforesaid, and a toothed gear member carried at the periphery of each of the discs, the distance between the axes of the tivo discs being such that the projection Will remain in engagement with the slot in all angular positions of both discs.
In testimony whereof l adiX my signature.
HEADLEY TOWNSEND BACKHOUSE.
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|US4757722 *||Oct 27, 1986||Jul 19, 1988||Glover Marvin J||Motion conversion apparatus|
|U.S. Classification||74/63, 74/50|