US1181766A - Stopping mechanism. - Google Patents

Description

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IMIPHI'QII May 1916.

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STOPPING MECHANISM. 7 APPLICATION FILED APILZZ. 1914.

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STOPPING MECHANiSM.

I m y w APPLICATION FILED APR- 27, I914- Hf Li a an Patoni'ed Mag; 2, 1910.

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STOPPING MECHANISM.

APPLICATION my) APR. 21, 1914.

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GEORGE S. HILL, F STRAFFDRD, NEW HAMPSHIRE, ASSIGNOB 10 UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CO EPORATION OF NEW JERSEY.

STOPPING MECHILNISM.

WWI-Ill!) Application filed April 27, 1914. Serial No. 834,720.

To all whom it may concern:

Be it known that I, Gnonen S. HILL, a citi- Zen of the United States, residing at Straiford. in the county of Straiford and State of New Hampshire, have invented certain new and useful Improvements in Stopping Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertai'ns to make and use the same. I

The invention relates to stopping mechanism for button-hole sewing or other machines in which the machine or some mechanism of the machine is to be stopped in predetermined position.

The object of the invention is to provide novel and improved means for throwing out the stopping mechanism when for any reason it is desired to turn the driving shaft by hand, and for preventing the throwing in of the driving mechanism until the parts are again restored to their normal condition.

To these ends the invention consists in the features of construction and combina-.

tions of parts hereinafter described and referred to in the claims.

The features of the invention willv he readily understood from an inspection of the accompanying drawings and the following detailed description of the mechanism illustrated therein. 1

In the drawings, Figure 1 is a front elevation showing so much of a buttonhole sewing machine as is necessary to illustrate the application of the invention thereto; Fig. 2 is a detail sectional view showing the parts in stopping position; Fig. 3 is a similar view showing the position of the parts when the driving shaft has been turned manually through a partial revolution; Fig. 4- is a plan view showing the parts for rendaring the, stopping devices and the automatic starting devices inactive in normal position' Fi". 5 is a similar view showiin a :1 h

the parts in a position corresponding to Fig. 2): Fig. (3 is a plan view of the driving and stopping mwhanism; Figs. 7, S and 9 are details of the devices For engaging and disox'lgaging the driving clutch. and Fig. 10 is a detail vertical sectional view of the parts shown in Figs. 2 and 4.

in the drawings the invention is shown embodied in a buttonhole sewing machine having the general construction and mode Specification of letters Patent.

Patented May 2, 19116.

of operati'o'fihf the machine shown and described in Patent No. 1,063,880, June 3, 1913.

In this machine the stitch forming mecha-- nism and the mechanism for feeding the work clamp are driven during the sewing of the buttonhole from a driving shaft 2.

The mechanism for driving and stopping the shaft comprises a continuously rotating drivlng pulley 4; which is loosely mounted" on a sleeve 6 surrounding the shaft. The pulley is provided with an internal clutch; face adapted to coiiperate with a clutch disk 8 which is fast to the shaft. The pulley isforced in a direction to engage the clutch members by a spring 10 interposedbetween the end of the sleeved and a knurled head 12 secured to the end of the shaft. The pulley;

is moved against the tension of the spring to disengage the clutch members through pins 14. which pass through the hub of the clutch disk 8 and are interposed between the end of the sleeve 6 and a bearing plate 16 which loosely surrounds a sleeve 18. A ball bearing 20 is interposed .between the disk 16'and the end of a clutch actuating sleeve 9.2 which 15 mounted to turn loosely on the sleeve 18.

The sleeve 22 is provided with two cam segments 24 arranged to cooperate with cam segments 26 formed on a stationary disk 28 in moving the driving pulley against the' tension of the spring 10 to disengage the clutch members, and in allowing the pulley to be moved in the opposite direction by the spring to engage the clutch members. The" cam sleeve 22 is rocked in a direction to disengage the clutch members by a rack 30 formed on the upper end of a vertically movabl bar 32, the lower end of which rides on a cam rib 34 secured to the upper face of the cam ca rryinglgear 36. .When the bar 3). rides up on to the cam rib, the cam sleeve 22 is rocked so that the cams 94 and 26 force the sleeve in a direction to disengage the clutch members. of the cam rib, the sleeve is allowed to rock in the opposite direction so that the spring Hi engages the clutch members.

\Vhen the members oi the driving clutch are disengaged, the shaft 2 is stopped in a predetermined position by a stop arm 3d carrying a stud 40 which cooperates with a stop cam 4-2 connected with the clutch disk 8. The stop cam is mounted on the hub of the clutch disk 8. and is connected there with by a pin Mawhich passes through a.

segmental slot formed in the clutch disk, and is engaged by one end of a spring 46. the other end of which bears against a lug 48 on the clutch disk.

he stop arm 38 is rock shaft 50, and is connected with a spring 52 which yieldingly supports the arm in position with the upper end of the shaft against a stop screw 54, and also tends to swing the arm in a direction to bring its stud 40 into the path of thest-op cam 42. \Vhen the clutch members are in engagement, the stop arm is held out of the path of the cam 42 against the tension of the spring 52 by a cam 55 on the carrying; gear 36 which engages an arm 56 on the lower end of the shaft 50. The cams 34 and 55 are so arranged that when the clutch members are disengaged the arm 56 is released so that the spring 52 may swing the stoparm into active position and bring its stud 40 into the path of the cam 42. At this time the stop 40 rides along the inclined side 58 of the cam, so that the stud moves gradually into the path of the cam. After the clutch members have been disengaged. the rotation of the shaft 2 continues under the inertia of the parts, and the end of the stud 40 rides over the braking portion 60 of the cam 42, which depresses the stop arm against the tension of the spring 52, thus gradually overcoming the momentum of the parts. As the end of the stud rides oii' the portion 60 of the cam, it is engaged by the abrupt rise (32, so that the shaft 2 is brought to rest with the end of the stud in the low part or depression between the braking portion 60 62 of the cam, as indicated in Fig. When the stop arm swings into active position. the stud 40 rides against a wear plate 6% which is secured to the rear face of the cam 42 and acts to accurately position the stud with relation to the cam.

In order that the stopping mechanism may operate in the most 'eflicient manner. and with the minimum shock and jar, it is desirable that the point in the rotation of the shaft at which the clutch members are disengaged should be varied in accordance with the speed at which the machine is being driven. ll the speed increases at any time during the operation of the machine, the clutch members should be disengaged earlier in the rotation of the shaft, in order that the momentum of the parts may be propenly overcome before the shaft reaches the stopping position. If the speed decreases, on the other hand. the clutch members should be disengaged later. in order that the parts may be brought to stopping position by the momentum of the parts. Means is accordingly provided by which the operator may quickly and conveniently vary the timing of the clutch dissecured to a vertical and the stopping portion engaging devices. In the construction shown, this is accomplished by forming worm teeth on the periphery of the stationary cam disk 28, which are engaged by a worm (36 secured on a shaft 68. The shaft is provided with a knurled head which is in position where it may be conveniently manipulated by the operator during the running of the machine. in case it is found desirable to vary the timing of the disengagement of the clutch by reason of any variation in the speed of the driving mechanism through which the machine is driven.

In the battonhole sewing machine illustrated the stopping devices are so arranged that the shaft 2 is brought to rest when the needles of the stitch forming mechanism are retracted, the under needle being withdrawn below the work clamp where it is not conveniently accessible to the operator. In order that the under needle may be rendered conveniently accessible. as. for instance. when it is to be threaded. it is desirable that provision be made for turning the shaft 2 through at least a partial revolution by hand. To enable this to be conveniently done. devices are )rovided by which the operator may render the stopping devices inactive. and in order that injury to the machine may not result from failure the parts to their normal position before starting the machine. these devices include means for preventing the engagement of the driving clutch members until the devices are returned to normal position.

In the construction shown the means for remlering the stopping devices inactive and preventing the engagement of the driving clutch members comprise a bell crank lever. one arm 72 of which extends into position where it is within convenient reach of the operator, and the other arm 74 ofwhich is provided with a cam 7(' for engaging the end of the stop arm 38 and swinging it into inactive position. The arm 74 of the lever is also provided with a projection Th. which is broughtinto the path of a stop shoulder S0 when the lever is operated to more the stop arm 38 out of active position. The stop shoulder 80 is formed on a flange of the clutch disk 8. and this flange is'also provided with a recess 82 and a locking surface 8+ extending from the recess to the stop shoulder. The recess is in position to re ceive the projection 78 on the arm 7% when the parts are in stopping position. as indirated in Fig. 2. If the shaft is turned from stopping position after the bell crank lever has been swung into position to bring the projection 78 into the recess 82, then the locking surface 84 engages the projection 78 and prevents the returnof the bell crank to restore lever to normal inactive position until the v shaft has been returned to its normal stopping position.

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The hub of the hell crank lever is provi'cied with 1:. suppoi 86 and arranged to coopci'etc W'i'iJil e swipe-rating block 90 which. is sicui'a-zcl to the clutch operating rack bar The block 90 is provided with projeccion arranged to register with the recess 88 and with a recess 9e errangcd to regimel" wick the support 86 when the bell crank lever is in normal inactive position, Fig, 2. When the lever is moved into the position indicated in 3 to throw the stop erm out of active position, the support 86 is moved. under who pro gection 92 so i'ihaxt it acts to support the rack bar in case the supporting cam rib 32 should pass from under "who bar, and prevente the engagement of the members of the drivin, clutch until the bell crank lever I that the devices for throwing out the stop ping mechanism and for insuring the return of the shaft to normal stopping position. had not been thrown out of action before the machine was started.

While it is preferred to employ the specific construction and arrangement of pests shown and described in applying the invcntion to the machine illustrated in the drawings, it will be ul'lderstood that the invention is not confined in its appiicetiou to this machine, and that the omen-notion. and arrangement of the parts; may be vzu'iezi. and n'lodified as may be found (1e, able or best suited to the construction oi the ma chine in which it is to be embodied.

Having explained the nature and object of the invention, and specifically described one form of mechanism in which, it may be embodied, what is claimed isc 1, A. machine of the class described, ho Eng", in, combination, u. driving shaft, driving mechanism therefor, chi-vices :Fm' stoop be shaft in a prev]Mei-mined position u ahe. ch'ivin mechanism is thrown one whereby tic operator new render the stop ping devices inactive to ermbie the shaft to be izm'nedhjv hand, and means for preventring the thILOWiIIg in of the driving meche- Ilifim While the stopping; devices remain inactive.

2. A machine of the class described, hav ing, in. combina'fizion, fldi'iving' shaft, driving mechanism therefor, devices for gstopv ping the shaft in a predetermined position when the. diiiving mechanism is thrown out, and devices under the control of the oper 111301 for .rendering the stopping devices inactive to enable che shaft he turned by hand and for preventing the" throwing in of the ciz-iving mechanism.

3. A machine of the class tiescribeci, hav ing, in combination, a. shaft, driving mech anism therefor, stopping devices for arresting the sheik in predetermined position, means under the control of the operator for rendering the stomping: devices inactive and limiting the movement which may be g sren to the shaft by band, and means for preventing; the throwing in of the dil'iving mechanism winie said operator controlled means is out of its ui'igginei position.

4. A machine of the CiZLSS described, having, in. combination, a shaft, a, driving chitch, mechanism for engaging and. disengaging the clutch, stopping devices for er resting the she-ft in pi-ec'ietermined position when the clutch disengaged inchioh ing a stop arm, :1 manimliy operated cam for moving th stop aim out of active position, one, means connected with the cam for preventing the engoo'en'ient of the clutch.

5. A n'mchinc of he class described, having, combinetion, e shaft, devices for stopping the shaft in e preetermined position including; e. stop com and spring pressed stop member, an OPGI'ELtiHg cam for moving said member out of the path of the stop coin, and a we; 1* piece connected to the .ie stop mm M in ich the member vices when l'cieuse its operating com.

(3. A machine oi": the described, having, in combixmtion, a shaft, 21 c]u tc11 me1n-- be! secured iio the shaft, stop cem con nected with the clutch. member, :2 Wear disk secured to the side of the stop com, a. stop arm having a stud for engaging the stop. cam, EL spring, for forcing the stud against 'zhe disk, and m o 'ierailing gear for movii'lg the arm mini stmi ou; of the path obe shin com.

GEGRGE HILL. -Wi"imesees k-res'rini E. Rooms,

LAURA. M. Goonmoom.

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