US2037088A - Sewing machine - Google Patents

Description

H. 1 PLAMONDQN Filed Oct. 3 Sheets-Sheet l April 14, 1936. H. L, FLxx/nohlnoj SEWING MACHINE Filed oct.

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Patented Apr. 14, 1936 UNITED STATES PATENT OFFICE 2 Claims.

My invention relates to sewing machines and more especially to an auxiliary feed mechanism commonly called a puller feed that may be attached to existing machines without changing the mechanism thereof.

The object of my invention is to provide a puller feed mechanism that can be readily placed in either operative or inoperative position by the operator.

To this end my invention comprises a rotary shaft having a puller roll secured to one end thereof and mounted at its other end in a bearing pivoted for movement in a substantially vertical plane. My invention comprises also a spring member bearing at one end on said rotary shaft and pivoted at the other for movement in a substantially horizontal plane, said member being moved out of engagement with the puller feed shaft in order to permit the latter to be swung upwardly into inoperative position.

In the drawings which accompany and form a part of this specification:-

Figure 1 is a side view of a sewing machine provided with my improved puller feed;

Fig. 2 is a plan view; Fig. 3 is a rear end view; Fig. 4 is a vertical section taken on the line 4-4 of Fig. 2;

Fig. 5 is a horizontal section taken on the line 5--5 of Fig. 3;

Fig. 6 is a fragmentary end view, parthr in section showing the position of the bearing of the puller feed shaft when the latter is in inoperative position.

In the particular drawings selected for more fully disclosing the principle of my invention, I I) is a sewing machine having the usual head .II and drive shaft I2. Disposed on the bed plete forwardly of the needle and primary feed mechanism is an auxiliary feed roll or puller roll I3, secured for rotation with the shaft I4, the inner end of which has it bearings in the block I5 pivoted to the support member I6 for movement in a vertical plane by the pin I1.

Pivotally connected to the block I8 by the screw I 9 is a spring finger 2Q, to the outer end of which is secured a saddle 2| having a curved under face which bears on the shaft I4 to augment the pressure of the feed roll on the work.

When the use of the auxiliary feed is not desired, the operator swings the spring finger 20 in a substantially horizontal plane, as indicated in dotted lines in Fig. 2 and then swings the shaft I4 upwardly in a substantially vertical plane. as indicated in Fig. 6, the friction between the block I5 and the blocks I6 and |8 being sucient to maintain the puller in inoperative position until it is again lowered to the position shown in Fig. 1.

While a variety of mechanism may be used to actuate the shaft I4 and its puller roll through the mechanism of the sewing machine, I have for completeness of illustration shown one form of mechanism that has proven effective in practice. The support member I6 is attached to the bed plate of the machine by the bolts 22, and disposed on said block I8 is a housing 23, secured thereto by the screws 24. Said housing affords Y a bearing for the shaft 25, to one end of which transmitting motion to the shaft 32, also having f its bearings in the portion I8 of the block. In the present instance a four-point cam 33 co-operating with a cone 34 secured to the shaft 32 is employed, said cone being disposed for slight longitudinal movement along the shaft 32 by the spring 35 interposed between the same and the nut 36, in order to compensate for wear. By this means an intermittent movement corresponding in time and degree with the movement of the primary feed, and therefore with the movement of the Work across the bed plate, is obtained. It will be understood however that my invention is not limited to intermittent puller feeds.

To the other end of the shaft 32 is connected the pinion 31 which meshes with the pinion 38 on the puller feed shaft I4.

Having thus described an illustrative embodiment of my invention without however limiting the same thereto, what I claim and desire to secure by Letters Patent is:

1. A sewing machine comprising in combination a substantially horizontal shaft, a block affording bearings for one end of said shaft, means pivotally connecting said block for movement in a Vertical plane, a puller feed roll secured to the other end of said shaft, and means connecting said shaft for actuation by the sewing machine mechanism.

2. A sewing machine comprising in combination, a shaft pivotally connected to a support for movement in a vertical plane, spring means pivotally connected at one end to a support for movement in a substantially horizontal plane and bearing at its other end on said shaft, a puller feed roll secured to said shaft, and means connecting said shaft for actuation by the sewing machine mechanism.

HENRY L. PLAMONDON.

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