US1095373A

US1095373A - Gearing.

Info

Publication number: US1095373A
Application number: US54740410A
Authority: US
Inventors: Bruce Borland
Original assignee: Individual
Current assignee: Individual
Priority date: 1910-03-05
Filing date: 1910-03-05
Publication date: 1914-05-05
Anticipated expiration: 1931-05-05

Description

B. BORLAND.

GEARING. APPLICATION FILED MAR. 5, 1910.

Patented May 5, 1914-" 1?? finial? CMIIIA PLANOfll-APH $0.. WASHINGTON, D. C

B. BORLAND.

GEARING. APPLICATION FILED MAR. 5, 1910.

1,095,373, Patentd May 5, 1914.

2 SHEETS-SHEET 2.

therein to toe llhll BRUCE BORLAND, OF CHICAGO, ILLINOIS.

GEARING.

T0 (ZZZ whom it may concern Be it"known that 1, Button BORLAND, a citizen of the United States, residing at Ohicago, in the county of Cook and State of lllinois, have invented certain new and useful Improvements inGearing, of which the following is a specification, reference being had 1 accompanying drawing.

My invention relates to gearing, and the purpose is to providea new and improved gearing for rotating a suitable element, such for example as the winding drum or spool of a motion-picture machine; and the invention consists in the matters hereinafter set forth and then pointed out in the claim.

In order to show a practical application on my invention 1 illustrate it in connection with a moving picture machine in which it is utilized to impart intermittent rotary mo tion to the winding drum or spool upon which the film is wound, and in the accompanying drawings, Figure 1 is a detail view of a portion of a moving picture machine equipped with an embodiment of my present invention: F 2 is a sectional view on the line 22 of Fig. 1 and looking in the direction of the arrows; Fig. 3 is a detail view showing the positions of parts when the rotating eccentric pin enters a radial groove in the star-gear or is at the beginning of its stroke thereon; Fig. 4 is a similar view showing the positions of the same parts when the pin is at the end of its stroke in the groove; Fig. 5 is an enlarged detail view of parts showing their positions when the pin is at the end of its stroke in the groove; and Fig. G is a detail sectional view of parts shown in Fig. 5.

In the drawings the reference numeral 10 indicates the frame of a suitable motion-picture machine carrying suitable spools or drums 11 upon which a suitable film is wound; one of the drums is fixed to a shaft 12 suitably ournaled in the casing and carrying a fixed star gear 13. A driving disk or wheel 14 is journaled to freely revolve upon a fixed shaft 15 and receives motion from any suitable source; in the present illustration it is provided with an attached pinion 16 which also freely revolves on shaft 15 and is driven b pinion 17 fixed on a revolving shaft 18 having a suitable crankhandle 19 outside the casing. A fixed gear 20 is mounted on the shaft 15 coaxially with the disk 1 1 having a hub 21 pinned to the shaft. A spur gear or pinion 22 is revolubly Specification of Letters Patent.

Application filed March 5, 1910.

Patented May 5. 1.914.

Serial No. 547,404.

mounted on a stud 23 on the disk 14 and meshes with, and is revolved upon its hearing by, the fixed gear 20 as the disk 14rrevolves. The spur gear 22 carries an eccentric pin 2 1 which takes into the radial grooves 25 of the star gear 13, the concaved curved parts 26 of the star gear coiiperating with a correspondingly convexed curved flange 27 on the disk 14 and serving as a stop for the star gear, the flange surrounding the fixed gear and being cut away as shown opposite the spur pinion 22 and for sufficient distance on either side thereof to allow the projecting arms of the star wheel to clear it as the parts revolve. The spur gear 22 turning freely on its central stud 23 is carried around by the driving disk 14: which freely turns on its fixed shaft 15, and when the disk 14: is turned the'spur gear 22 is made to revolve on its stud by meshing with the fixed gear to revolve the eccentric pin around the center of the spur gear 22; the motion of the pin 24 is therefore the resultant of the revolutions of the disk let and gear 22. The fixed gear 20 is provided with as teeth, and the spurgear 22 with 16 teeth so that the latter revolves on its own pivot or center three times for each revolution around the gear 20, although of course the ratiomay be varied.

The parts are arranged so that the pin 2 1 enters one of the radial grooves of the star wheel when at an angle of about degrees from the line through the

shafts

12 and 15 and when the groove is at an angle of 15 degrees to the same line, and as the disk l lrevolves the fixed gear 20 will rotate the spur gear so that the pin 2 1 will rot-ate eccentrically on the disk 14, its movement being the resultant of the two motions of the disk 14 and gear 22. The rotation of the eccentric pin about the center of the spur gear causes it'to travel inwardly from and at a tangent to the line of the groove, and so to pick up or turn the star wheel sooner than. it would if it were fixed Or concentric with the disk wheel; when the parts reach the position of Fig. 2 the pin has made approximately a halfrotation, and when in the position of Fig. 4: approximately one rotation on its own pivot. The travel of the pin in engagement with the groove may be divided into four par-ts; the first and fourth part-s result in a movement of the star gear equal to the movement of the pin by the disk 14: plus its eccentric movement by the spur gear, and the second and third parts result in a movement of the star gear equal to the movement of the pin by the disk minus its eccentric movement. lVhereas the movement of the star Wheel With a. pin traveling in a path concentric with the shaft 15 would be from zero at Fig. 3 to about 2.4: times the speed of the drive 14 at Fig. 2 at ap proximately constantly increasing velocity and thence down to zero at Fig. 4 at approximately constantly decreasing velocity, the movement of the star Wheel by the rotating eccentric pin is from zero at Fig. 3 to 1.20 the speed of the drive Wheel at approximately constantly increasing velocity during about the first quarter of the time the pin and star wheel, are in engagement, then for the second and third quarters of the time of their engagement at approximately a. uniform velocity of 1.20 the speed of the drive Wheel, and then for the last quarter of this engagement at approximately uniformly decreasing velocity from 1.20 the speed of the drive wheel to zero.

Various changes and modifications in form and arrangement may be made Without departing from my invention.

Having described my invention, I claim:

In a device of the class described, a fixed shaft, a driving disk rotatably mounted on the shaft and having a concentric flange suitably cut away for a portion of its length, a rotatin star gear interlocking with the flange and Whose arms pass into the cutaway portion of the flange, a gear fixed on the shaft and located inside the flange of the driving disk, a spun gear revolubly mounted on the disk at the cut-away portion of the flange and engaging the fixed gear, and a pin eccentrieally mounted on the spur gear to engage the radial grooves the star Wheel.

In testimony whereof I aflix my signature in presence of two Witnesses.

BRUCE BORLAND. lVitnesses Gnonen R. HARBAUGH, J. MoRoBnnTs.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C.