US1708296A - Arm and bedplate for sewing machines - Google Patents

Description

April 9, 1929.

C. H. GREENWOOD 'ARM AND BED PLATE FOR SEWING MACHINES Filed June 9, 1923 2 Sheets-Sheet 1 gwvmtoz C. H Greerzwaod April 9, 1929. c. H. GREENWOOD ARM AND BED PLATE FOR SEWING MACHINES Filed June 9, 1923 2 Sheets-Sheet 2 CH. Greenwood Sign Patented Apr. 9, 1929.

CHARLES H. GREENWOOD, 0F CANTON, OHIO.

ARM AND BEDPLATE FOR SEWING MACHINES.

Application filed. June 9, 1923.

This invention relates to die castings for the arm and bed plate of a sewing machine, and has for its objects to provide a sewing machine arm formed. oftwo similar halves, one-half of the bed plate being formed intogrally with each half of the arm.

The above and other objects may be attained by constructing the parts in the manner illustrated in the accompanying drawings, in which Figure l is a top plan view of the arm and bed plate castings assembled;

Fig. 2, an elevation of the inner side of the casting for one-half of the arm and bed plate;

Fig. 3, a front end elevation of the same; Fig. 4, a rear end elevation of the same; Fig. 5, section on the line 55, 2; Fig. 6, a section on the line 66, 2; Fig. 7, a section on the line 7-7, Fig. 2;

' formed in a single casting, an arm being connected thereto by screws or the like. Such a construction requires considerable machine work in order to the mechanism within the arm and base plate and the presentimprovement is designed to overcome all of this expensive machine work by forming the arm and base plate of two similar die castings connected together through their longitudinal center.

The arm and base plate are made up of two substantially similar sections 1 and 2, the section 1 being shown in Fig. 2. Each section comprises one-half of the base plate, as shown at 3, one-half of the standard 4-, one-half of the arm 5 and one-half of the head 6.

The standard portion of each casting is provided With a half of a bearing shown at 7, these portions being arranged to register Whenthe halves are connected together as shown in Fig. 1. The bearing 7 is aligned with similar bearings 8 and 9 formed in Serial No. 644,395.

each half of the arm. The bearings 7 8 and 9 are aligned to receive the usual driving shaft which is provided at its outer end with the usual hand wheel, and has its inner end operatively connected to the mechanism within the head for reciprocating the needle bar and the associated mechanism.

Each half of the standard is provided with a half of a bearing 10 and each half of the base plate has a half of a bearing 11 aligned with the bearing 10, and arranged to re'seive a vertical shaft which transmits power from the drive shaft to a horizontal shaft which is mounted in bearings 12 and 13 formed upon the under side of each half of the base plate, this last named shaft being provided for transmitting power to the shuttle which is mounted beneath the forward end of the base plate in the usual manner, each section of the base plate being cut out as at 14. to receive the usual shuttle plate.

Each section of the head 6 is provided with the central, vertical, half round hearing portion 15 arranged to receive the usual vertically slidable needle bar and the section 1 is provided with a vertical bearing 16 to receive the usual presser foot bar.

Dowel pins 17 are provided in different portions of the inner face of one section to be received in corresponding apertures in the other section, in order to properly center the two halves, screws 18 being located through transverse apertures 19 in the two sections for the purpose of combining the same together.

Referring to Fig. 7, it will be noted that a partition wall 20 is provided through which the upper end of the presser bar bearing 16 is extended, thus preventing oil from passing down through the head and on to the presser foot. The presser foot lift lever is extended through the slot 21 which terminates at the partition wall 20.

By forming the castings in this manner it will be seen, by referring to Fig. 2, that oil wells are provided in the head, to oil the working parts therein, and also in the arm and the standard, between the bearings 8 and 9, and the bearing 9 and bed plate respectively, thus providing self oiling means being provided with half round grooves atfor all of the inclosed Working parts of the ranged to register Witheach other and form machine.

I'claim An article of manufactureincluding a pair of similar hollow die castings, each comprising one-half of the bed plate, standard, arm

and head of a sewing machine, said castings bearings for the driving shafts of the sowing machine. I

In testimony that I claim the above, I have hereunto subscribed my name.

CHARLES H. GREENWOOD.

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