US2281575A - Pinking machine - Google Patents

Description

M. GLAssBr-:RG E-rAL 2,281,575

PINKING'MACHINE Filed Sept. 26, 1939 2 Sheets-Sheet l beg? Morris Glez l I I! Ilz! May 5, 1942.

m NN N Z May 5 1942- M. GLAssBERG ET Al. 2,281,575

` PINKING MACHINE Filed Sept. 26, 1939 2 Sheets-Sheet 2 Patented May 5, 1942 PINKING MACHENE Morris Glassberg and Bernard Chester, Kingston,

N. Y., assignors to Clear Bed Super-Finkel Corporation, Kingston, N. Y., a corporation of New York Application September 26, 1939, Serial N o. 296,563

(,Cl. 11B- 122) 16 Claims.

This invention relates to sewing machine attachments and more particularly to an improved attachment for pinking. This attachment is designed for use on sewing machines of the type of the 95 Class Singer machines and those of similar construction.

The purpose of the invention is to provide a pinker, simple in operation with a minimum number of parts which, with the exception of the cutter or knife, will be wholly beneath the bed of the sewing machine.

A further object of our invention is to provide a pinking mechanism that can be thrown in and out of operation instantaneously and which when thrown out of operation leaves the sewing bed of the machine free and unencumbered for plain sewing.

A further object is to provide a simple positive acting pinker in which the actuating arm, the only reciprocating member, is of a floating nature with weight and frictional points reduced to a minimum, thus providing greater wearing qualities with less vibration.

Another object is to provide an attachment of the type described that may be easily installed on existing machines without removing the machine from the owners premises and without milling or otherwise mutilating the machine or ailecting its normal eciency.

In the accompanying drawings- Fig. 1 is a side view partly in cross section showing one form of our improved pinker;

Fig. 2 is an end view thereof taken on the line 2-2 of Fig. 1;

Fig. 3 is a sectional View showing the means for throwing the pinker out of operation;

Fig. 4 is a plan view of the knife section of the` pinker showing the throat plate;

Fig. 4a is a perspective view partly in section of two pieces of cloth which have been top stitched together with the pinker in operation;

Fig. 5 is a sectional view of a piece of cloth which has been run through the machine with the pinker in operation;

Fig. 6 is a side view similar to Fig. 1, of a modied form of our invention;

Fig. 7 is an end View taken on the line 1 1 of Fig. 6.

Referring more particularly to the drawings, our device is adaptable to be attached to the bed I0 of the conventional machine of the type of 95 Class Singer sewing machines having the usual hook shaft II, shuttle I2 and throat plate I3. The device is supported by a substantially U-shaped member I4 which is fastened to the bed I0 by means of bolts I5 passing through the L-shaped ends I6 of the member I4. A set screw I'l is also provided to adjust the position of the member I i with relation to the bed IU. Due to the nature of the bolts I5 and the use of the set screw I'I it is possible to attach our device to the bed of the sewing machine without milling the bottom thereof and by merely drilling andtap-- ping two holes in the bed of the machine. p

Mounted on the member I Il in the bushing 20 is a shaft 2E. On the outer end of the shaft 2I is a reduction gear 22 fastened thereto by a gear hub 23 and a set screw 24. The gear 22 engages a smaller gear 25 fastened on the hook shaft II by means of a gear hub 26 and a set screw 2l.V

. edges 6I which are adapted to engage cutting edges 62 of the throat plate I3.

The upper end of the arm 4l) is curved at 4I to allow its passage around the hook shaft Il and the lower end 42 is cut away to form a fork around the bearing extension 28. The lower ends of the fork are joined by the bolt 43. Mounted on the arm 4E] is a fixed roller 45 which engages the inner face 46 of the camS. Pivotally mounted on the arm 4i) is a second roller 41 which engages the outer face 48 of the cam 30. The roller 41 is mounted on the pivotal member 50 which pivots on the eccentric bolt 5I. It will be seen that by loosening the lock nuts 52 and rotating the bolt 5I the pressure of the roller 47 against the outer face of the cam 48 may be adjusted.

Pivoted on the arm 49 at 55 is an elbow leverI 56. Running from one end 51 of the elbow lever 55 to the member 5i) at 58 is a leaf spring 59. When the elbow lever 56 is drawn backwardly and downwardly as shown in Fig. 1 the leaf spring 59 is drawn directly across a pivotal point 55 of theelbow lever 5S in a locked position bringing the end 51 of the lever 5B and the connecting point 58 of the member 50 in a direct line with the pivotal point 55. Thus the member 50 is held backwardly against the arm 4I) by the leaf spring 59 maintaining the roller 4'! in contact with the outer face i8 of the cam 3i). In this position with the roller contacting the inner face 46A of the cam Sil and the roller il contacting the outer face 48 of the cam 3l] the arm 40 will move upwardly and downwardly as the cam 33 rotates, thus actuating the pinking knife Eil.

Mounted on the center 1Q of the U-shaped frame I4 and pivoted at 1i thereto is an elbow member 12. Roller bearing 13 is mounted on the upper section 14 of said elbow 'I2 and a bolt or screw 15 passes through the lower end IS of said elbow and contacts the bed or center 'Il of the frame I4. It will be seen that by turning the bolt 15 the position of the elbow member 12 and roller bearing 13 will be changed and the pressure of the roller 13 against the floating arm 4Q may be varied.

On the bolt 43 at the bottom of the fork 42 is a spring 65 which engages a hook 66 at the end of the bracket 61 mounted on the bottom or supporting frame I4. The bracket 61 is secured by the screws or bolts 63 which engage a slot in the bracket 61 so that the pressure on the spring 65 may be varied. The action of the spring 65 is to maintain pressure on the lower end of the floating arm 4l) which pivots on the roller bearing 13 so as to force the cutting edges 6I of the knife 60 against the edges 62 of the throat plate I3 in order to insure cutting action as the knife moves downwardly against the throat plate.

When the pinker is to be thrown out of operation the movement of the lever 5'6 forwardly and upwardly as shown in Fig. 3 will carry leaf spring 59 forwardly thus releasing the member 50 and moving the roller 41 upwardly and out of contact with the face 48 of the cam 3U. The

arm will then be brought downwardly by the action of the inner face 46 of the cam 3l] upon the roller 45 and will maintain this position by virtue of its own weight together with pressure of the knife 3B on throat plate I3 and the tendency of the spring to draw the arm 40 to its lowest position. In this position the roller 45 is out of contact with the inner face 46 of the cam 3i) and the pinker is entirely out of operation. When the pinker is to be operated lever 5S is pulled downwardly thus bringing the roller 41 into engagement with the outer face 48 of the cam 30. This will cause the pinking knife to move upwardly and downwardly in the throat plate I3 with the edges 6l of the pinking knife engaging edges 62' of the throat plate I3 and to pink the cloth A (as shown in Fig. 5) as the sewing machine sews. With our machine it is not only possible to do straight stitchingas indicated in Fig. 5 but it is also possible to do top stitching as indicated in Fig.

4a, a conventional part of the machine turning the cloth before it is stitched. It will be seen that the operation of the pinker in no way affects or limits the use of the sewing machine.

In the modified form of the invention shown in Figs. 6 and 7, the two-faced cam is not necessary, and a single faced elliptical cam 363 engages a roller 8| mounted on the lower portion 82 of the arm 43. It will be noted in Fig. 7 that the fork 42 is closed to form the single arm 82. In the mcdied form a spring 83 is connected at 84 to the bottom of the U-shaped member I4 and runs at an angle to a hook 85 on the lower end 82 of the arm 4B. The action of the cam upon the roller 8| forces the arm 4i) downwardly against the spring B3 with the edges 6I of the knife 60 against the edges 62 of the throat plate I3. The spring 83 acts to move the arm upwardly and to keep the roller 8i in contact with the face 8B of the cam 8l).

CII

A cam lever is mounted upon the lower end 82 of the arm 43 and pivoted thereto at SI. The cam lever 9U is provided with a handle 92 which extends through the lever 9B to form a stop against the lower end 82 of the arm 4D at 93. When the pinker is to be thrown out of operation the cam lever 98 is swung upwardly, the extended part thereof 34 engaging the lower end of the frame I4 and holding the arm 40 in a downward position. In this position roller BI is out of contact with the face 86 of cam 86 and the knife G0 is held at its lower position in the throat plate I3 and out of action.

When the operation is to be resumed cam lever S0 is swung downwardly withdrawing the extended edge 94 from the lower end 95 of the frame I4 thus permitting the spring 83 to move the arm 43 upwardly and causing the roller 8l to contact and engage the face 8B of the cam 80 moving upwardly and downwardly with it to actuate the arm 40 and hence the pinking knife B. It will be noted that spring 83 is at an angle with relation to the arm 40. Thus it not only tends to keep the roller in contact with face 8B of the cam 80 but exerts a backward or sideward tension on the arm 43 pivoting on the roller 13 so as to keep the cutting edges 6I of the knife 60 in pressure contact with the cutting edges 62 of the throat plate I3 to insure a cutting action as the knife moves upwardly and downwardly. The spring 83 may be attached to a slidable bracket similar to the bracket G1 shown in Fig, 1 in order that the angle of the spring 83 may be varied and thus increase or decrease the tension on the arm 43 when variation of cutting pressure of knife E!) upon throat plate I3 is desired.

It will be appreciated that with our improved construction the device utilizes a minimum of moving parts and the one reciprocating member 43 being of floating design is reduced in weight with the resultant reduction of vibration to a minimum. Furthermore, this type of construction will transmit less vibration to the bed of the sewing machine to which it is attached so as not to disturb its normal operation. As previously stated it is possible with our device to convert the standard sewing machine into one which pinks as it sews without mutilating or destroying the machine for plain sewing or affecting its operation in any way. At the same time our device provides for the instantaneous throwing in and out of operation of the pinking mechanism .at the will of the operator.

We claim:

1. A pinking attachment for sewing machines including a frame-adapted to be mounted below the bed of said sewing machine, a shaft in said frame, means engaging the hook shaft of the sewing machine to rotate said shaft, a two-faced cam on said shaft, a floating arm, rollers on said arm engaging said cam, and a pinking knife mounted on said arm.

2. A pinking attachment for sewing machines comprising a pinking knife, an arm engaging said knife and extending below the bed of said machine, rollers on said arm, an eccentric cam contacting said rollers, and means for throwing one of said rollers out of operable contact with said cam.

3. A pinking attachment for sewing machines comprising a frame adapted to be placed below the bed of said machine, a shaft in said frame, gear means to operate said shaft, a oating arm,

a knife on said arm, a cam on said shaft, and roller means on said arm engaging said cam.

4. The combination with a sewing machine of pinking mechanism comprising a ledger blade, a pinking head for coacting with the ledger blade, an arm carrying said head, and means for operatively holding said arm in a floating condition including a member in sliding engagement with said arm and spring means for continually biasing said arm about said member in a direction to insure a clean shearing action on the downward strokes of said arm and head.

5. The combination with a sewing machine of pinking mechanism comprising a throat plate, a pinking head for pinking coaction with the throat plate, an arm carrying said head and extending into the sewing machine, and means for operatively holding said arm in a floating condition including a member in sliding engagement with said arm and spring means connected with said arm for continually pivoting said arm about said member in a direction to insure a clean shearing action on the downward strokes of said arm and head.

6. The combination with a sewing machine of pinking mechanism comprising a throat plate having an opening with converging shearing walls, a pinking head with converging walls for coacting with the throat plate walls, an arm carrying said head and extending into the sewing machine beneath the bed thereof, means for operatively holding said arm in a floating condition including a member in sliding engagement with said arm and resilient means connected with said arm for continually urging said arm about said member and in a direction whereby the apex of said head is urged towards the apex of said throat plate to insure a cl-ean shearing action on the downward strokes of said arm and head, and means coupled to said floating arm for reciprocating said head in said throat plate.

7. 'I'he combination with a sewing machine of pinking mechanism comprising a throat plate having an opening with converging shearing walls, a pinking head with converging walls for coacting with the throat plate walls, an arm carrying said head and extending into the sewing machine beneath the bed thereof, means for operatively holding said arm in a floating condition including a member in sliding engagement with said arm and spring means connected with said arm for continually biasing said arm about said member in a direction whereby the apex of said head is urged towards the apex of said throat plate to insure a clean shearing action on the downward strokes of said arm and head, and means coupled to said floating arm for operating said head in said throat plate upwardly and downwardly.

8. The combination with a sewing machine of pinking mechanism comprising a throat plate, a pinking head for pinking coaction with the throat plate, an arm carrying said head and extending into the sewing machine, and means for operatively holding said arm in a floating condition including a member in sliding engagement with said arm and spring means connected with said arm for continually pivoting said arm about said member in a direction to insure a clean shearing action on the downward strokes of said arm and head, and means coupled to said floating arm for operating said head in said throat plate upwardly to the extent of raising said head to clear the plane of said plate and permit material to pass rial by the coaction of said head and said plate.

9. The combination with a sewing machine of.

pinking mechanism comprising a throat plate, a

pinking knife for coacting with said throat plate, i

a oatingly supported arm carrying said knife and extending into the sewing machine beneath the bed thereof, and means coupled to said arm for operating said knife upwardly to clear the l0 plane of said plate and permit material to pass therebetween and downwardlyy to pink the matethroat plate walls, a fioatingly supported arm carrying said head and extending vertically into the sewing machine beneath the bed thereof, and means connected with the apparatus driving said 'ineedle and coupled to said floating arm for operating said head in said throat plate in timed relation with said needle comprising cam means, reduction gearing between said driving apparatus and said cam means, and cam follower means 36""-mounted on said arm and engaging said cam means.

1l. The 'combination with a sewing machine having a reciprocatory needle of pinking mechanism comprising a throat plate having an openging with converging shearing walls, a pinking head with converging walls for coacting with the throat plate walls, an arm carrying said head andextending vertically into the sewing machine beneath the bed thereof, means for operatively holding said arm in a floating condition including a roller in sliding engagement with said arm and spring means connected with said arm for continually pivoting said arm about said roller in a direction whereby the apex of said head is urged towards the apex of said throat plate to insure a clean shearing action on the downward strokes of said arm and head, and means connected with the apparatus driving said needle and coupled to said floating arm for operating said head in said throat plate in timed relation with said needle comprising cam means, reduction gearing between said driving apparatus and said cam means, and cam follower means mounted on said arm engaging said cam means.

12. The combination with a sewing machine having a reciprocatory needle of pinking mechanism comprising a ledger blade having an opening with converging shearing walls mounted substantially ush with the bed of the machine, a pinking knife with converging walls for successively coacting with the ledger blade walls, a oatingly supported arm carrying said knife and extending into the sewing machine beneath the bed thereof, and means connected with the apparatus driving said needle and coupled to said floating arm for operating said knife in said ledger blade in timed relation with said needle comprising a cam, reduction gearing between said driving apparatus and said cam, a roller mounted on said arm and engaging said cam, and an instrumentality for disengaging said arm from said cam to hold said pinking knife inoperative in said ledger blade and substantially flush with the top surface thereof.

13. The combination with a sewing machine therebetween and downwardly to pink the matehaving a recinroeatory needle of pinning meehenism comprising a throat plate mQunted substantially in the plane of the top bed of the sewing machine and having an opening with converging shearing walls, a pinking head with converging walls for coacting with the throat plate walls, a floatingly supported arm carrying said head and extending vertically into the sewing machine beneath the 'ced thereof, means `connected with the apparatus driving said needle and coupled to said oating arm for operating said head in said throat plate in timed relation with said needle comprising a cam, reduction gearing between said driving apparatus and said cam, and a cam follower mounted on said arm and engaging said cam, and an instrumentality for disengaging said arm from said cani to hold said pinking head inoperative in said throat plate and substantially flush with the top surface thereof.

14. The combination with a sewing machine of pinking mechanism comprising a throat plate, a pinking head for pinking coaction with the throat plate, an arm carrying said head and extending into the sewing machine, means for operatively holding said arm in a oating condition including a member in sliding engagement with said arm and spring means connected with said arm for continually pivoting said arm about said member in a direction to insure a clean shearing action on the downward strokes of said arm and head, and an element for adjusting the pressure of said member on said arm.

15. The combination with a sewing machine of pinking mechanism comprising a throat plate, a

pinking knife for coacting with said throat plate, L

a oatingly supported arm carrying said knife and extending into the sewing machine beneath the bed thereof, and means coupled to said arm for positively operating Said knife upwardly t0 clear the plane of said plate and permit material to pass therebetween and downwardly to pink the material by the coaction of said knife and said plate comprising a double faced cam, two

rollers mounted on said arm and respectively engaging the faces of said cam, and an instrumen-y tality for disengaging one of said rollers from said cam to hold said pinking knife inoperative and substantially flush with the top surfaces of said throat plate.

16. The combination with a sewing machine of pinking mechanism comprising a throat plate having an opening with converging shearing Walls, a pinking head with converging walls for coacting with the throat plate walls, an arm carrying said head and extending into the sewing machine beneath the bed thereof, means for operatively holding said arm in a floating condition including a member in sliding engagement with said arm and spring means connected with said arm for continually biasing said arm about said member in a direction whereby the apex of said head is urged towards the apex of said throat plate to insure a clean shearing action on the downward strokes of said arm and head, an element for adjusting the pressure of said member on said arm, means coupled to said floating arm for operating said head in said throat plate upwardly and downwardly comprising a double faced cam, two rollers mounted on said arm and engaging the faces of said cam, and an instrumentality for disengaging one of said rollers from said cam to hold said pinking head inoperative and substantially flush with the top surface of said throat plate.

MORRIS GLASSBERG. BERNARD CHESTER.

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