US2151345A - Fur sewing machine - Google Patents

Description

March'ZI, 1939; c. BONIS I FUR SEWING MACHINE Filed Jan. 14, 1958 3 Sheets-Sheet l INVENTOR. (oeser Ben/s BY "Lu ATTORNEY.

March 21,1939. I NI 2,151,345

FUR SEWING MACHINE Filed Jan. 14, 1958 s Sheets-Sheet 2 INVENTOR. C 0650f Ban/'5 ATTORNEY.

March 21, 1939. c, BQN|s 2,151,345

FUR SEWING MACHINE Filed Jan. 14, 1938 '3 S heets-Shee t s /f IN VENTOR.

BYL

ATTORNEY.

Patented Mar. 21,1939

; UNITED STATESPATENT OFFICE Application January 14, 1938, Serial No. 184,925

1 mm.- (c1. 112-18) This invention relates to fur sewing machines and more particularly to the driving mechanism of the material feeding disks thereof, said driving mechanism being of the intermittent type.

One object of the invention is the provision of a driving mechanism of this nature which is both positive and instantaneous on the forward and return stroke thereof.

Another object ofthe invention is the provision of a device of the character referred to which will include means for positively braking the material feeding disks against rotation when the needle is in the forward or needle plate position.

A further object of the invention is the provision of a retainer for positively holding the drive shaft of the device against rotation on the idle or return stroke of the clutching member forming a part of the driving mechanism.

Another object is to produce a device of the character described in which the maximum simplicity of construction and operation is secured.

Other objects and advantages will appear as the nature of the improvements is better understood, the invention consisting substantially in the novel arrangement and co-relation-of parts herein fully described and illustrated in the accompanying drawings, wherein similar reference characters are used to' describe corresponding parts throughout the several views, and then tical embodiment thereof, but the invention is not to be restricted to the exact details of this disclosure, and the latter, therefore, is to' be understood from an illustrative, rather than a restrictive standpoint.

In the accompanying drawings;

Figure 1 is a side view in elevation of a fur sewing machine with sumcient of its mechanism shown to aid in the explanation of the present invention;

Figure 2 is a front view thereof;

Figure 3 is a fragmental sectional view taken on line 33 Figure 2;

V Figure 4 is a longitudinal sectional view taken on line 4-4 Figure 1 with the worm gear represented diagrammatically;

Figure 5 is a sectional view taken on line 55 54 Figure 7 lsa longitudinal sectional view with the parts in somewhat different position than shown in Figure 4 of a modified form of the invention.

Referring now to Figures 1 to 6 of the drawings in detail l0 indicates the main drive shaft 5 of the machine upon which the usual driving pulley H is mounted. Secured to the shaft I0 is an eccentric or cam l2 encircling which there is a hub II of a lever M the lower end of which is secured to the rear end of a horizontally dis- 10 posed rocker arm i5 mounted upon a pivot I6 slidably adjustable in a slot I! in one wall of the machine frame I8. The rocker arm I5 is provided with an elongated slot l9 to permit of adjustment of the pivot l6, 1

The driving mechanism for the material feeding device comprises a horizontal drive shaft 20 mounted upon trunnions 2| and 22 and has secured to one end thereof a drum 23 having a cylindrical recess or chamber 24 concentric with 20 the said shaft and in which is located a clutch member 25 loosely mounted upon the shaft 20. Thesaid member 25 is provided with four undercuts or recesses 26 each of which is provided withfa peripheral curved and eccentric surface 25 21. Projecting arms or extensions 28 are formed between the undercuts 26 and the said extensions are each provided with an aperture or hole 30 in which there is mounted a coiled spring 3| exerting a tension against a headed stud or 30 plunger 32 in contact with a roller 33 to force the said roller toward the narrow end of its undercut 26 and wedge same between the eccentric surface 21 and the peripheral surface of the recess or chamber 24. 35 Secured to the member 25 by means of screws 35 is an end plate 36 which is provided with a pair of ears 3! which carry screws 38, the heads of which are in engagement with one surface of an annular flange 39 on the drum 23 40 to connect the end plate 36 to the drum and to prevent the clutching member 25 and rollers 33' from falling out of the chamber 24'. The end plate 35 is further provided with an ear or extension 40 (seeFigures 1 and 2) to which 45 is secured by means of a stud 4| the forward. end 42 of the rocker arm l5. v

The end of the drum 23 opposite to the flange 33 is provided with a recess or depression 44 forming an annular ring 45 which is serrated 50 to form a worm gear having teeth 46 adapted to mesh with the curved worm-like teeth 41 of a gear 48 secured to the lower end of a vertical shaft 49 to the upper. end of which is secured one material feeding disk 50. The shaft 49 is rotatably mounted in frame I8 and in a boss 5i at the front of the said frame. Collars 52 and 53 secured to the shaft 49 one above and the other below the boss 5| prevent vertical movement of the said shaft. A second material feeding .disk 54 in operative engagement with the disk 50 is carried upon an arm 55 suitably supported on the frame H3 at 56 and 51. The disk 54 is provided with the usual needle plate 58 to receive the needle 59 when in forward position the said needle being carried by the needle,

. 62 concentric with the shaft 20 (see Figures 12, 3

and 4). Located within the said recess 62 is a clutch member 63 similar in all respects to the clutch member .25, but is provided with three undercuts or recesses 64 each of which is provided with a peripheral curved and eccentric surface 65. Arms-or extensions 66 formed between the undercuts 64 are each provided with a hole or aperture 61 for the reception of a headed plunger 68 which is pressed forwardly against a roller 69 by means of a spring I to force the said roller toward the narrow end of the undercut 64 and wedge same between the curved surface 65 and the periphery of the chamber 62. Secured to the clutch member 63 by means of screws H is a cover-plate 12 having an extension or arm I3 (see Figure 3), which is fastened to the frame it of the machine by means ofv a screw 14. The plate is maintained in position on the housing 6| by means of a headed screw 15 in engagement with a flange 16 on the said housing and by a plate 11 secured to the plate 12 and in engagementwith the flange l6.

The operation of the device is as follows;

Rocking movement to the rocker arm I is imparted by the eccentric operated lever l4. When the rear end of the said rocker arm I5 is swung downwardly the forward end of the said rocker arm will rotate the drum 23 and gear 45 in clockwise direction through the connections 36, 4| and the clutching member 25 and rollers 33, said movement being transferred to the shaft 20 and therethrough to the housing 6|. During the said rotary movement the gear 45 will drive the material feeding disks 56 and 54 through the gear 48 and shaft 49. When the lever l4 pulls the rear of rocker arm upwardly the clutch member 25 will be carried or swung out of wedging engagement with the rollers 33 and will idle back without rotating the shaft 20 or drum 23 untilthe rear of the rocker arm is again swung downwardis accomplished by means of theplate 12 which is secured to the machine frame and held stationary by the screw 14. It will be remembered that the clutch member 63 is secured to the said plate 12 and cannot therefore move out of wedging engagement with the rollers 69, thus assuring and providing positive retaining means for the said shaft 20.

Due to the curvature of the gear-teeth and I- find that due to the curved eccentric surv 41 practically all of the back lash between the said gears is eliminated thus providing a braking or looking action between the gears 45 and 48 1 against manually rotating the material feeding disks. This braking action is very desirable or essential, since no movement of the disks 50 and 54 is permissible, during thev period when the needle 59 in engagement with the needle plate 58, since such movement would cause the needle to break.- The period when theneedle is in engagement with the needle plate 58 corresponds or coincides with the period during which the driving clutch 25 is idling.

In Figure 7, I have shown a modified form of my invention wherein, instead of using a combined drum'and gear'in the driving clutch mechanism, I employ a gear 45 having the gear teeth 46 in the end edge thereof,.the said gear being secured to the shaft 23 by means of one or more set screws 15. Secured to the rear wall of said gear'45 by means of pins or'rivets I6 is a clutch member 25 which is in all respects similar to the clutch member 25 and is provided with the cooperating rollers 33 and springs and plungers 3| and 32 respectively, the said rollers; springs and plungers-not being shown as the section is so taken where they cannot be seen. A separate loose fitting ring 11 encircles the clutch member the inner surface or circumference 18 thereof acting in the same capacity as the surface 24 of the drum 23. Secured .to the ring 11' is a cover plate 36* which is connected to the forward end of the rocker arm l5.

The retaining means in this form of the invention.comprises a sleeve 80 secured to the shaft 20, and to which sleeve desirable manner the clutching member 63. A ring or housing 6| sleeve 80 and has secured thereto the plate 12 the arm 13 of which istsecured to the frame of the machine as in the first form of my invention.

. there is secured in any is loosely mounted on the I spring pressed plungers 68 as shown in Figure 5.

The ring 6| and the plate 12 are maintained on the sleeve 80 by means of a washer 8| and a headed over portion 82 at the end of the sleeve 8|). The plate 12 may be secured to the ring 6| by pins or rivets 83'or by any other suitable means.

The modified form of the invention herein shown like the form shown in Figures 1 to 6 is oscillated by the rocker arm l5, but instead of moving the drum 23 and housing 6| about the respective clutching members 25 and 63, the said .clutching members are moved within the respective interiors of the ring 11 and housing 6|, the net'final results being the same as in the form ofmy invention first described. v

From the foregoing it will be seen that I have provided a simple and efiicient intermittent driving mechanism for the material feeding disks of fur sewing machines, one which will positively and instantaneously clutch on the operating or material feeding end of the movement and which will just as readily and positively release on the idling or return end of the movement.

It will further be seen that my device also provides emcient braking and shaft retaining meanswhich will not permit of reverse movement of the drive shaft on the return end of the driving clutch mechanism and will likewise prevent any rotation of the material feeding disks when the needle has penetrated the material sewn and is inv the needle plate.

Having described my invention, what II claim as new and desire to secure by Letters Patent is:

An intermittent driving mechanism for a sewing machine comprising a shaft, a drum secured to the shaft and having a recess at one end con-' centric with the shaft and having'a peripheral surface, a gear at the other end of said drum, a clutch member loosely mounted on the shaft within the recess of said drum and having peripheral secured to the clutch member, means for oscillating said plate, a shaft retainer'on said shaft in spaced relation to the clutching means, said retainer comprising a cup-shaped housing secured to the shaft and having an inner peripheral surface, a clutch member loosely mounted on the" shaft and having peripheral recesses with curved s and eccentric surfaces confronting the peripheral surface of the housing, rollers in said recesses. spring pressed plungers carried by the clutch member to force its rollers into wedging engagement with the interior peripheral surface of the in housing and the curved and eccentric clutch surfaces, a plate secu'redto the clutch member, a second shaftdisposed transversely of the first mentioned shaft intermediate the drum and the shaft retainer, and a gear on the second men- 1 tioned shaft in mesh with the first mentioned gear.

A" CAESAR

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