US1419996A - Take-up motion - Google Patents

Description

F. E. VALOIS.

TAKE-UP MOTION. 4 APPLICATION FILED Aus. I. 191s.

4 SHEETS-SHEET l.

Patented June 20, 1922.

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TAKE-UP MOTION.

APPLICATION FILED IIU(1I.'Il 1918. v 1,419,996' Patented June 20, 1922.

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F. E. VALOIS.

TAKE-UP MOTION.

APPLICATION FILED Aue. I, 19m.

-Patented J 11116.20, 1922.

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- AITyS- ELX EMTLE VALOIS, GF HAVERHILL, MA.

SSACHUSETTS, ASSIGIL'OR T0 HAMEL SHOE CH'USETTS.

TAKE-'UP MOTION.

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Application filed August 1, 1918.

i 10 all yifi/"1.0m t may concern.'

`which the Afollowing is a specification, rei'erence being had therein to the accompanying drawings.

'This invention relates to take up mechanism for shoe sewing machines. (.)ne object of the invention is to provide atake up which can be operated without the use oi grooved cams such as have heretofore been employeiil 'for this purpose. Another object is to provide vmechanism which will produce the downward movement oli the take-up during rotation ot' the main shaft through an arc of not more than about (30 degrees. Another object is to cause the take up to have a satis- ;tactory upward movement.

The mechanism by means oi which the take up is operated consists in general ot a crank and connecting rod or pitman.v the connecting rod being cont-rolled by a link one end oilf which is pivoted to the connecting rod intermediate its ends and the other end of which .has a pivotal point oiz connection, the position oi" which is varied in time with the rotation oi the machine. As will be eir-A plained more in detail, this mechanism may be run at high speed and although the loop is pulled down during about one-sixth oli the revolution ot the main shaift, this part oit the machine operates with perfect smoothness. There is more than one method by which the change in position of the point ot connection oiI the controlling link may be varied in time with the machine. Two mechanisms 'for this purpose are described herein but the invention is not limited to the 'forms shown except as stated in the claims since it is intended to claim the ii'lvention in the broadest possible manner.

The invention will be fully understood :from the following description when taken in connection with ,the accompanying drawings and the novel features thereof' will be pointed out and clearly defined in the claims at the close ot this speciication.

` ln the drawings, Fig. 1 is a side elevation partly in section oa portion ot a take-up mechanism and the related parts/ol` a shoe sewing machine embodying the invention.

Specification of Letters Patent.

latented J une 20; 1%22.

serial No. 247,749.

2 is a front View ot the parts shown in i* 10'. 1.

ig. 3 is a View similar to Fig. 1 showing a mod ilied form oli the invention.

w Fig. el is a View similar to Figs. 1 and 3 showing another modification of the invention.V

Relerring'now to the drawings and particularly to Figs. 1 and 2 at 11 is shown the needle, at 12 the work table, at 13 the looper and at lel- 'the shuttle. The mechanism bv means of which these and the other working mstrumentalities of the sewing machine are given their proper motions is not shown in the present application as these have nothing to do with the hereindescribed invention. At 15 is shown the take up rollV mounted on an arm 16. This arm is part of a rock shaft 1i' oscillatably mounted on the frame 18. The highest position of the'take up roll 15`is shown in Fig. 1 in dot and dash line. and the lowest position is shown in full line. kAs

stated previously the dri\f'ing mechanism.

which will now be described causes the take up roll to move :from the highest position to the lowest position during a movement of the main shaft 19 through an arc of about 60 degrecs. pulling down and setting the loop which has just passed over and around the shuttle.

At 20 is shown an arm on the rock shaft 17 to which is pivot-ally connected the link 21. The upper end ot' the link 21 is piroted at 22 to the outer end oli the triangular connecting rod or pitman 2?), the other end being carried by the crank pin 24 of the crank 25 on the main shaft 19. The crank rotates in the direction indicated by the arrow in Fig. 1. At 26 is shown a pair of controlling links, one end of which is pivotally connected at 2T to the connecting` rod at a point intermediate the crank pin 24 and the point ot connection 22 with the link 2l. The pivot 2T is also located at one side of' the line between the crank pin 24- and the pivot 22. The other end olZ the controlling link 26 is caused to change its position in time with the movement of' the mainV shaft. This is accomplished by means of a swinging link 28 pivoted to the controlling link 26 at the point 29 and at its other end to a pivot 30 mounted on a lined part of the machine. At 31 is shown a transverse link which causes the pivot 29 to travel in the are of a circle yabout the fixed This movement is fior the purpose of pivot 30. The link 3l is itself moved by a cam fork 32 pivoted at 33 on the frame ofthe machine and moved by an oscillating cam 34 on a rocker shaft 35. The rocker shaft 35 is caused to oscillate in time with the main shaft 19 by any suitable mechanism as for instancea crank 36 act-ing on a iioating disk 49 surrounded by one end of a connecting rod 37 the other end of which is secured to an arm 38 on the rocker shaft 35. Specific details of such mechanism. are fully described in my co-pending application Ser. ,No 247,753, filed August l, 1918, t0 which application reference may be had for further disclosure of this feature ofthe invention.

In its operation the machine nieves the take-up from the position shown in dot and dash lines to the position shown in full lines during a movement of the main shaft of about one-sixth of a revolution or G() degrees. At the same time the cam fork 32 assumes the position shown in Fig. l. This causes the pivot 29 to move in the arc of a circle about the fixed pivot 30 and causes the controlling link 2G to push down the connecting rod 23 very rapidly. This has the effect of moving the long link 2l and the take-up down with great rapidity as shown in Fig. il.

In Fig. 3 is shown a modification of the hereindescribed improved take up operating mechanism. In this form of device, the rock shaft 17, link 2l, connecting` rod 23and crank 25 are the same in general construction as in the form of mechanism shown in Figs. l and 2. At 40 is shown the cont-rolling link one end of which is pivoted at 27 to the connecting rod ..3 and the other end of which is pivoted to a pin 4l mounted on an eccentric 42 on a. shaft 43. The shaft 43 extends through the hanger 4,4 and has on its other end an arm 45 which causes the eccentric shaft to oscillate. In the form shown in this figure, this link is connected to a connecting rod 46 which :forms part of the needle drive. By this arrangement, the arm 45 serves the double purpose of operating the eccentric 42 and controlling the position of the needle drive connecting rod 46. The operation of the mechanism shown in Fig. 3 is substantially the same as that shown in Figs. l and 2. The position of the pivot pin 41 for the controlling link 40 is shifted during the downward movement of the take up and greatly increases the rapidity of said downward movement.

In Fig. 4 is shown a third form of mechanism embodying my invention. In this form, the triangular connecting rod 50 is acted upon by a controlling link 5l, one end of which has a stationary pivot 52, but the link which connects the connecting rod 5() with the rock shaft 53 of the take-up is made in two pieces 54 and 55 pivot-ally connected at 56. The pivot 56 is acted upon by a link 57 moved by the cam fork 58 and cam 59.

rIhe effect of this mechanism is the same. The movement ofthe link 57 straightens suddenly the toggle joint formed by the two links 54 and 55 and thus gives the take-up the quick movement required.

The three mechanisms shown and described herein are capable of being operated at high speed and when so operated run without noise or This is due largely to the fact that the movement is produced mainly by acrank and connecting rod instead of by a grooved cam and follower' as heretofore. The mechanism described is simple and cheap to construct and wears well. In addition it is possible to produce a more rapid downward movement of the takeup and still run the machine at high speed than has heretofore been possible where a cam has been used as with such mechanism the speed of movement of the take-up is limited b v'the :fact that the cam will pound if made too steep especially when the machine is run at high speed.

lVhat I claim is:

l. In combination with a working instrumentality of a sewing machine, a crank, a connecting rod connected to said crank for actuation thereby, a connection joining the connecting rod and the working instrumentality, a controlling link one end of which is connected to the connecting rod, and a cam moving in time with the machine, a cam follower operated by said cam and acting on Vthe saidcontrolling link to vary its position in time with the machine.

2. In combination with a take-up of a sewing machine, a rotary crank, a connecting rod, a connection joining the connecting rod and the takeup, a controlling link one end of which is connected to the connecting rod, and means to vary the position of the other end of said controlling link.

3. In combination with the take-up of a sewing machine, a rock shaft on one arm of which the take-up is mounted and to the other arm of which is connected a link, a crank. a connecting rod, the free end of which is attached to said link, a controlling link one end of which is connected to the connecting rod, and means to vary the position of the other end of the controlling link in time with the movement of the machine.

4. In a machine of the class described, in combination, an oscillatable take-up and mechanism for actuating said take-upcomprising a driving crank, a lconnecting rod or pitman pivotally connected to said crank, means for transmitting the motion of said comlecting rod or pitman to said take-up, a second driving element, and means connecting said element with said rod or pit-man for modifying the movement imparted thereto by said crank.

5. In a sewing machine, in combination, a movable take-up and mechanism for actuating the same, said mechanism comprising a rotarily driven crank provided with a. crank pin, a connecting rod or pitman having one extremity pivoted upon said crank pin, means connecting the opposite extremity of said rod or pitman to said take-up, and a second driving element operatively connected with said rod or pitman intermediate its ends for modifying the motion imparted to said rod or pitman by said crank.

6. In a sewing machine, in combination, a movable take-up, a rotary driving member, a link interposed between said take-np and said rotary driving member, a rocker-member, 'connecting means for imparting motion from said rocker-member to said takeaip, and means independent of said connecting means for driving said rocker-member.

7. In a sewing machine, in combination, a movable take-np, a rotary driving member, a link interposed between said take-up and said rotary driving member, a rocker-member, connecting means for imparting motion from said rocker-member to said link, and means independent of said connecting means for driving said rocker-member.

8. In a sewing machine, in combination, a movable take-up, a rotary driving member, an oscillatory driving member, connecting means for driving said take-np from both of said members, and means independent of said connecting means for moving said driving members.

9. In a sewing machine, in combination, a movable take-up, a crank, a rocker-shaft, connecting means for driving said takeaip simultaneously from said crank and rockersha'ft, and means independent of said con necting means 'for driving said rocker-shaft.

' In testimony whereof I afiiX my signature.

FLIX EMILE VAILOIS.

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