US2846965A

US2846965A - Feeding mechanisms for sewing machines

Info

Publication number: US2846965A
Application number: US523296A
Authority: US
Inventors: Edward J Herbst
Original assignee: Singer Co
Current assignee: Singer Co
Priority date: 1955-07-20
Filing date: 1955-07-20
Publication date: 1958-08-12
Anticipated expiration: 1975-08-12
Also published as: DE1005354B

Description

5 Sheets-Sheet 1 INVENTOR Herbs? ORNE Y Edward J BY W M c nm N w m 2 mm I E. J. HERBST FEEDING MECHANISMS FOR SEWING MACHINES Aug. 12, 195

Filed July 20, 1955 Aug. 12, 1958 E. J. HERBST FEEDING MECHANISMS FOR sEwIm MACHINES 3 Sheets-Sheet 2 Filed July 20, 1955 \XNN N. E 8 my 5 ,M a. :N N m MUM 5 8 w: EWII W .I fi 1 3 M.. 8 MN. 8 T 8 8 8 E, w: m: x 2. mlL fin am I 5 I d W Em m2 Q 4 .EU I fil E E m N E. J. HERBST FEEDING MECHANISMS FOR SEWING MACHINES 3 SheetsSheet s TORNE Y Aug. 12, 1958 filed July 20, 1955 United States Patent FEEDING MECHANISMS FOR SEWING MACHINES Edward J. Herbst, South Plainiield, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. 5., a corporation of New Jersey Application July 20, 1955, Serial No. 523,296

6 Claims. (Cl. 112-210) This invention relates to feed-dog throw-out devices associated with the feeding mechanism of sewing machines and more particularly the invention relates to im proved means for operating feed-dog throw-out devices.

Various types of feed-dog throw-out devices, which are designed to inactivate or disable the work-feeding mechanism of a sewing machine when it is used for darning, embroidering and other similar operations, are known but many of the previous devices have been expensive to manufacture and/0r difficult to operate. Therefore, the primary object of the present invention is to provide an improved feed-dog throw-out device.

Another object of the invention is to provide a feeddog throw-out device which will have a minimum amount of lost motion or shake.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the drawings,

Fig. l is a bottom plan view of a portion of a familytype sewing machine embodying the present invention,

Fig. 2 is a sectional view taken on the broken line 2-2 of Fig. l and shows in elevation the feed-dog throw-out device,

Figs. 3A and 3B are sectional views taken on the broken lines 3A-3A of Fig. 2; Fig. 3A showing the feeding mechanism adjusted for normal sewing, and Fig. 3B showing the feeding mechanism disengaged for darning or embroidering,

Fig. 4 is an exploded perspective view showing parts of the device as illustrated in Figs. 1 through 3B,

Fig. 5 is a view similar to Fig. l but showing a bottom plan view of a modified form of feed-dog throw-out device,

Fig. 6 is a sectional view taken along the line 6-6 of Fig.5,

Fig. 7 is an elevationalview, partly in section and taken along the line 7-7 of Fig. 7,

Fig. 8 is an enlarged sectional view taken on the line 8-8 of Fig. 5,

Fig. 9 is an enlarged sectional view taken on the line 9-9 of Fig. 7,

' Fig. 10 is a view, partly in section, taken on the line 10-10 of Fig. 5, and

Fig. 11 is an exploded perspective view showing parts of the device as illustrated in Figs. .5 through 10.

In the selected embodiment of the invention illustrated in Figs. 1-4 inclusive, numeral 16 designates-the bedplate or base of a family-type sewing machine. The lower side of the base 16 carries a plurality of depending lugs which in a known manner pivotally support a pair of substantially conventional rock-shafts, one of a ce these being the feed-advance rock-shaft 17 and the other being the feed-lift rock-shaft 18. Suitable rocking movements are imparted to-the feed-advance rock-shaft 17 and to the feed-lift rock-shaft 18 by any of the conventional means, for example, as disclosed in U. S. Patent No. 2,617,375. One end of the feed-advance rock-shaft 17 carries a feed-rocker 19 to the upper end of which is pivotally connected one end of a feed-bar 21. A central portion of the feed-bar 21, in a known manner, supports a feed-dog 22, whereas the end of the feed-bar 21 remote from the feed-advance rocker 19 is formed with a fork 23 and thereby receives a feed-lift roller 24 in a manner similar to that shown in U. S. Patent No. 1,908,292.

The bed-plate 16 (Fig. 2) is provided with an elongated hole 26 which accommodates the upper end of an upstanding operating lever 27 the mid-portion of which is pivotally supported on a pivot screw 28 secured to a depending web 29 formed on the bed-plate 16. The upper end of this operating lever 27 is provided with a fingerpad 31 which extends above an escutcheon plate 32 carried on the bed 16, the finger-pad 31 being accessible from above the bed-plate 16. The lower end of the lever 27 is pivotally connected by a screw 33 to one end of an operating rod 34 which extends horizontally below the bed-plate 16. The other end of the operating rod 34 is pivotally connected by means of a screw 36 to a depending lug 37 formed on the reach 38 of a U-shaped slider 39. The slider 39, as best seen in Fig. 4, has a pair of

arms

41 and 42 each being provided with a circular hole 43 by which the slider 39 is mounted for slidable axial movement on the feed-lift rock-shaft 18. The arm 42 of the slider 39 also has a depending leg 44 which is provided with an open-ended curved slot 46.

The curved slot 46 accommodates a reduced portion 47 of the head of a bullet-shaped cylindrical pin 48 having a tapered end 49. The tapered-pin 48 is slidably positioned in a horizontally extending cylindrical recess or hole 51 formed in the free end of a bracket 52 which, by means of a split clamp 53 and screw 54, is secured to and rocks with the feed-lift rock-shaft 18 of the sewing machine. The free end of the bracket 52 is also provided with a hole 56 which extends parallel to the rock-shaft 18 and parallel to the tapered-pin 48. The hole 56 receives the shank 57 of a pivot-pin 58, this shank being held in the hole 56 by a set screw 59. Pin 58, in addi tion to having the shank 57, has an enlarged portion 61 and a slotted head 62, and the shank 57 by passing through a hole 63 formed in a lever 64 pivotally supports the said lever 64. The lever 64 is biased to move in a clockwise direction, as seen in Figs. 3A and 3B, about the pivot-pin 58 by a coiled spring 66. To accomplish this, one end of the spring 66 enters a hole 67 in the head 62 of the pin 58, and the other end of the spring 66 enters a hole 68 in the lever 64. The tension of the spring may be adjusted by loosening the set screw 59 and by turning the slotted head 62 of the pin 58 with a screw-driver.

The lever 64 has an arm 69 the free end of which rotatably supports the, previously referred to, roller 24. The end of the lever 64 remote from the roller 24 has an open-ended U-shaped recess 71. The U-shaped recess 71 has two substantially straight sides 72 and 74, which as shown in Fig. 3A, may straddle the full circumferential portion of the tapered pin 48 when the end of said pin 48 is ejected from the hole 51 to the position shown in solid lines in Figs. 1, 2 and 3A. When the pin 48 is withdrawn to the position shown in dot-dot lines in Figs. 1 and 2 and as shown in solid lines in Fig. 3B, the spring 66 turns the lever 64 until the side 74 of the U-shaped recess 71 is close to the center line or axis of the'pin 48. This lowers the feed-bar 21 and feed-dog 22 so that the latter will be below the normal feeding position. In this condition, the sewing machine may be used for darm'ng, embroidering, etc. When the pin 48 is moved from the position shown in dot-dot lines in Figs. 1 and 2 to the position shown in solid lines in these same figures, the tapered end 19 of the pin 48 engage the side 74' of the U-shaped recess 71 and moves the lever 64 counterclockwise about the pivot pin 58 and against the bias of spring 66 to the position shown in Fig. 3A. This raises the feedbar 21 and places the feed-dog 22 in a position to perform normal feeding for the conventional sewing operation. It will be noted (Figs. 3A, 3B and that the pivot hole 63 for the lever 64 is in line with the center line between the two sides 72 and 74 of the U-shaped recess 71. In other words, the axis of the hole 63 in the lever 64 is contained in a plane extending midway between the two sides 7 2 and 74 of the U-shaped recess '71. Because of this arrangement practically all of the lost motion or shake which could exist between the sides 7274 of the U-shaped recess 71 and the cylindrical side of the pin 48 is eliminated. This provides for quiet and efficient operation of the mechanism.

The operation of the hereinbefore described device is as follows. Movement of the operating lever 27 to the position shown in solid lines in Fig. 2, causes the rod 34 to move the slider 38 and the tapered pin 48 to a position in which the tapered pin 48 enters the U -shaped recess '71. This connects the lever 64 to the bracket 52 and to the feed-lift rock-shaft 18. With this connection made the feed-bar 21 and feed-dog 22 function to feed the work in a well known manner, When the operating lever 27 is moved to the position shown in dash-dash lines in Fig. 2, the rod 34 and slider 39 retract the tapered pin 48 from engagement with the U-shaped recess 71 of the leve 6 This allows the spring 66 to turn the lever 64 to a position which will lower the feed-bar 21 and feed-dog 22 to a position suitable for darning and embroidering.

The modified form of the invention, which is illustrated in Figs. l1, inclusive, comprises a bed-plate or base 116, the lower side of which carries a plurality of depending lugs which in a known manner pivotally support a feed-advance rock-shaft 117 and a feed-lift rockshaft 118. Suitable rocking movements are imparted to these shafts by conventional means. The feed-advance rock-shaft 117 carries a feed-rocker 119 to the upper end of which is pivotally connected one end of a feed-bar 121. A central portion of the feed-bar 121 supports a feed-dog 122, whereas the end of the feed-bar 121 remote from the feed-advance rocker 119 is formed with a fork 123 and thereby receives a feed-lift roller 124! in the same manner as that shown in Figs. 1-4.

A bushing 125 (Fig. 9) securely held in a vertically extending hole 126 formed in the bed 116 pivotally carries a vertically disposed shaft 127, The upper end of the shaft 127 carries an upstanding operating knob 128 located near to the front right-hand corner of the sewing machine bed-plate 116, this knob 128 being provided with a combination handle and pointer which cooperates with indicia (not shown) carried by the bed-plate 116. The lower end of the shaft 127 carries a horizontally disposed lever 129 and a spring arm 130. The free end of the spring arm 130 engages a notched detent portion formed on a segment plate 131 suitably held to the lower end of the bushing 125. The shaft 127, lever 129 and spring arm 130 are biased downwardly by a dished spring washer 132. The free end of the lever 129 (Figs. 5 and 7) is pivotally attached, by means of a screw 133 (Fig. 7), to one end of an operating rod 134 which extends horizontally below the sewing machine bed 116. The other end of the operating rod 134 is pivotally attached by means of a screw 136 to the lower end of an upstanding U-shaped slider 139. The slider 139, as best seen in Fig. 11, has a pair of

arms

141 and 142, each being provided with a circular hole 143 by which the slider is slidably mounted on the feed-lift rock-shaft 118 (Fig. 7).

4 The arm 142 of the U-shaped slider 139 is also provided with an open-ended curved slot 146.

The curved slot 146 accommodates a reduced portion 147 of the head of a bullet shaped cylindrical pin 148 having a tapered end 149. The tapered pin 148 i slidably positioned in a horizontally extending cylindrical recess or hole 151 formed in the free end of a bracket 152 which by means of a hole 153 and a pin 154 is secured to and rocks with the feed-lift rock-shaft 118.

A double forked member 161) (Fig. 11) by means of a hole 185 is pivotally carried on the feed-lift rock-shaft 118. The bracket 152 and also the feed-lift rock-shaft 118 to which the bracket is attached are biased to move in a counterclockwise direction, as shown in Fig. 6 by a coiled spring 166 (Fig. 11). Turning of the feed-lift rock-shaft 118 by the spring 166 causes the feed-lift roller 124 to move the feed-bar 121 and feed-dog 122 to the lowered position, which position permits the sewing machine to be used for darning and embroidering. In order to bias the bracket 152 and the shaft 118, one end of the spring 166 enters a hole 167 in the bracket 152, and the other end of the spring 166 enters a hole 168 in the forked member 160. One fork 181 of the member is formed by tines 182182, whereas the other fork 186 is formed by tines 188-188. The fork 181 straddles a cam block 189 (Fig. 9) carried on a rotary shaft 191 of the operating mechanism of the sewing machine. The fork 186 is positioned substantially in line or register with the hole 151 which receives the pin 148 and thus when the operating knob 128 is turned in the proper direction to eject the pin 148 from the hole 151, the tapered end 149 of the pin 148 engages the tines 188-188 thereby making it possible for the pin 148 to connect the bracket 152 in operative cooperation with the double forked member 1619. This causes the feed-bar 121 and the feed-dog 122 to rise and fall as the cam block 189 rotates in the fork 1811.

Attention is called to the curved slot 46 formed in the slider 39 and to the corresponding curved slot 146 formed in the slider 139. In the first embodiment (Fig. 1) it will be noted that the slider 39 is not fixed on the shaft 18 whereas the bracket 52 is secured to the shaft by the screw 54. It will be remembered that the pin 18 is carried by the bracket 52 and that the reduced portion 47 of the pin 48 engages the slot 46. The curved shape of the slot 46 permits the pin 48 to move with respect to the slider 39 as the feed-lift rock-shaft 18 oscillates. In like manner the slider 139 is not fixed on the shaft 118 whereas the bracket 152 is secured to the shaft by the pin 154. Also the pin 14-8 is carried by the bracket 152, the reduced portion 147 of the pin 148 engaging the slot 146. The curved shape of the slot 146 permits the pin 148 to move with respect to the slider 139 as the feed-lift rock-shaft 118 oscillates.

Having thus set forth the nature of the invention, what I claim herein is:

1. A feed-dog throw-out device comprising in combination a feed-lift rock-shaft; a slider slidably mounted on though not rockable with said feed-lift rockshaft; an apertured bracket having one end secured to said feed-lift rock-shaft and therefore rockable therewith; a lever pivotally supported on the other end of said bracket; a pin slidably mounted in one of the apertures in said bracket and thereby rockable with said feed-lift rock-shaft, one end of said pin being tapered to engage said lever, and means connecting the other end of said pin to said slider for rocking of said pin relatively to said slider.

2. A feed-dog throw-out device comprising in combination a feed-lift rock-shaft; a slider slidably mounted on though not rockable with said feed-lift rock-shaft; an apertured bracket having one end secured to said feedlift rock-shaft and therefore rockable therewith; a lever pivotally supported on the other end of said bracket; said lever being provided with a U-shaped recess, the central plane bisecting said U-shaped recess containing the axis of the pivotal support for said lever; a pin slidably mounted in one of the apertures in said bracket and thereby rockable with said feed-lift rock-shaft, one end of saidpin being tapered to engage the U-shaped recess in said lever, and means connecting one end of said pin to said slider for rocking of said pin relatively to said slider.

3. A sewing machine comprising in combination a feed-lift rock-shaft; a feed-bar; a feed-dog carried by said feed-bar; an apertured bracket having one end secured to said feed-lift rock-shaft and therefore rockable therewith; a lever pivotally supported by the'other end of said bracket, and said lever being provided with a U-shaped recess, the central plane bisecting said U- shaped recess containing the axis of the pivotal support for said lever; a roller supported on the free end of said lever, and said roller engaging said feed-bar; means biasing said lever with respect to said bracket; a tapered pin slidably mounted in one of the apertures in said bracket, said tapered pin having a first portion adapted to enter the U-shaped recess on said lever; a slider slidably mounted on said feed-lift rock-shaft, said slider being provided with an aperture for receiving a second portion of said tapered pin; and means for moving said slider.

4. A sewing machine comprising in combination a feed-lift rock-shaft; a feed-bar; a feed-dog carried by said feed-bar; an apertured bracket secured to and rockable with said feed-lift rock-shaft; a pivot-pin supported by the free end of said bracket; a lever supported on said pivot-pin and said lever being provided with a U-shaped recess, the center line of said U-shaped recess being on a line which intersects the axis of said pivot-pin; a roller supported on the free end of said lever, and said roller engaging said feed-bar; means biasing said lever with respect to said bracket, a tapered pin slidably mounted in one of the apertures in said bracket, said tapered pin having a first portion adapted to enter the U-shaped recess on said lever; a slider slidably mounted on said feed-lift rock-shaft, said slider being provided with an aperture for receiving a second portion of said slider; and means for moving said tapered pin.

5. A sewing machine comprising in combination a feed-lift rock-shaft; a feed-bar; a feed-dog carried by said feed-bar; an apertured bracket secured to and rockable with said feed-lift rock-shaft; a pivot-pin supported by the free end of said bracket, said pivot-pin having a head; a set screw for adjustably securing said pivot-pin 6 to said bracket; a lever supported on said pivot-pin and said lever being provided with a U-shaped recess,

the center line of said U-shaped recess being on a line which intersects the axis of said pivot-pin; a roller supported on the free end of said lever, and said roller engaging said forked feed-bar; a coiled spring having one of its ends engaging the head of said pivot-pin and its other end engaging said lever; a tapered pin slidably mounted in one of the apertures in said bracket, said tapered pin having a first portion adapted to enter the U-shaped recess on said lever; a slider slidably mounted on said feed-lift rock-shaft, said slider being provided with an aperture for receiving a second portion of said slider; and means for moving said tapered pin.

6. A sewing machine comprising in combination a feed-advance rock-shaft; a feed-lift rock-shaft; a forked feed-bar one end of which is pivotally carried by said feed-advance rock-shaft; a feed-dog carried by said feed-bar; an apertured bracket clamped to and rockable with said feed-lift rock-shaft; a pivot-pin supported by the free end of said bracket, said pivot-pin having a head; a set screw for adjustably securing said pivot-pin to said bracket; a lever supported on said pivot-pin and said lever being provided'with a U-shaped recess, the axis of said pivot-pin being intersected by the center line of said U-shaped recess; a roller supported on the free end of said lever, and said roller engaging said forked feed-bar; a coiled spring having one end engaging the head of said pivot-pin and its other end engaging said lever; a bullet shaped tapered pin slidably mounted in one of the apertures in said bracket, said tapered pin having a reduced head portion adapted to enter the U-shaped recess on said lever; a two-armed U-shaped slider having a hole in each arm by which the slider is mounted on said feed-lift rock-shaft, and one of said arms being provided with a curved open-ended slot receiving the reduced head portion of said tapered pin; an operating rod one end of which is pivotally connected to said slider; an operating lever pivotally supported by said sewing machine; and means for pivotally connecting said operating lever to one end of said operating rod.

References Cited in the file of this patent UNITED STATES PATENTS 2,718,202 Johnson ct 1 Sept. 20, 1955' FOREIGN PATENTS 298,049 Great Britain Oct. 4, 1928 Au ust 12, 1958 Patent No. 2,846,965

Edward J, Herbst pears in the -printed specification It is hereby certified that error ap rection and that the said Letters of the above numbered patent requiring cor Patent should read as corrected below.

'7" read Fig 5 column 5, line "slider; and means for moving and insert instead w tapered Signed and sealed this 18th day of November 1958.,

(SEAL) Attest:

KARL H. AXLINE Attesting Officer ROBERT C. WATSON Commissioner of Patents