US1760712A - Variable-speed mechanism - Google Patents

Description

May 27, 1930. T. MoRlMoTo {IARIABLE SPEED MECHANISM Filed June 18. 1927 INVENTOR ZLSU] 1'/ MO/"imo WITNESS "7h W ATTORNEY Patented 'May 27, @19.30 f

y TTS'JE BOOTO, OF TEITOBY 0F HAWAH .application :Slee June 1S, 1927, Serial No. 199,807, and. in Japan' December, 1928.

This invention relates 'to automatic or power driven scissors intended especially for barbers use and has for its object the provision of reliable, compact and durable mechanism of this character.

Another object of the invention is the provision of a variable speed device for varying the speed at which the scissors action takes p ce. l v ther objects an'd advantages will be apparent to those skilled in the art.

, Referring to the drawings, A

Figure 1 shows a perspective view of the scissors taken from an oblique position and V showing part of the housing cut away to expose some of the working parts,

Fig. 2 is a side elevation of the scissors with part of thehousing plate cut away in order to show the operating mechanism,

Fig. 3 is an end elevation in section, taken on the line 2-2 of Fig. 1, also showing the operating mechanism ofthe scissors,4

Figure 4 is a horizontal section taken on lined-10i Figure 2; and i Figure 5 is a similar view taken on line 5-5 of Figure 2.

Referring now to the drawings, Figures 1,

2 and 3 at 2 indicate a blade of the scissors which is power driven and adapted to move 30 over a stationary blade 3. The movable blade is held to the housing-.32 of the scissors by a bolt 5 and nut 4. The stationary blade -is held tothe housing by the screw '6 transverse of a blade, and also another screw 6 which holds the shank of the stationary blade in the direction at right angles to that of the screw 6. Lower on the shank of the movable blade there is a screw 8 transverse of said shank- In the lower part of the blade 2 thereis a `15. The gear 15 is engaged by a worm 18 worm gear arrangement providing a means slot 2a in which a pin 10 carried by a gear 13 reciprocates. rlhis gear is held in lace by a stud 12 engaging the casing and is diven by a smaller gear 14 engaged in turn by worm gear whichis carried on the same shaft as the two spur gears-,17 and 19 respectively. Spur gear 19 is larger than spur gear 17 and forms the means with other spur gears namely at 20 and 22 whereby changes in speed may be accom- 60 plished. The gears-2O and 22 are connected together by a sleeve 20aA which is slidable on a fixed shaft'23 arranged below the worm 18. An eccentric 25 which is rotatable from the outside of the housing by av small handle 24 is engageable with either of the'gears 2O or 22 to shift them longitudinally. Rotation of this handle pushes the gears on the shaft to the left or right as the case may be and slides them in and out of engagement with gears 19 and 17. Normally one of these gears 20 and 22 is engaged by a drivepinion 27 This pinion is astened directly by means of screws to the extension of a flexible shaft 33 which enters the housing through its bottom portion.

Figure 2 shows more clearly thegear 15 which is a worm gear and lies on a gear 14, the rotation of gear 15 occurs by reason of the enmeshment of gear 18 with same, the

of driving the gear 15 at a moderate speed with an exceedingly fast speed rotation of the gears17 and 19.. v

It is to be understood that the iexible shaft 33 may be driven by any suitable means, for 'S5 instance, an electric motor or other engine or even by hand, by a suitable arrangement of gearing.

In operation the drive may be traced as shown in Fig. 1 rst through flexible shafts, 90 33 through pinion 27 to bevel gears 26 thence v to gear 20 and thence togear 17, thence through worm gear 18 to worm gear 15 thence to spur gear 14 thence to spur gear 13 the in 10, the motion of which'in the slot. 95 of tilie blade 2 provides a reciprocating motion and cutting action. It is to be understood that many minor changes and modifications ma be made in the device without de parting om the spirit of the invention, and

. these modifications I claim as my own if they fall within the scope of the appended claim.

I claim p ln a variablespeed mechanism, a supgort, a shaft mounted on the support, pinions xed to the ends of the shaft,` a driven gear su ported below the shaft, a longitudinally shi able sleeve arranged parallel tothe shaft, a bevelled gear fixed to each end of the sleeve and each carrying a inion upon its outer face, one of which bem normally in mesh with one of the first mentioned pinions, and manually rotatable cam element mounted on the support and lying between the opposed bevelled gears and movable against either of the latter to shift the sleeve vin a direction to cause the shaft to be driven through either one of the pinions carried thereby.

' TATSUJ I MORIMOTO. l

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