US2521085A - Machine for sewing buffing wheels - Google Patents

Description

Sept. 5, 1950 F. H. OGDEN MACHINE FOR SEWING BUFFING'WHEELS 2 Sheets-Sheet 1 Filed Sept. 11, 1947' Sept. 5, 1950 F. H. OGDEN MACHINE FOR SEWING BUFFING WHEELS 2 Sheets-Sheet 2 Filed Sept 11, 1947 Emmi" q -i H l mm. I 'IIILII w- Patented Sept. 5, 1950 UNITED STATES PATENT OFFICE MACHINE ron SEWING BUFFING WHEELS Floyd H. Ogden, Arlington, Mass.

Application September 11, 1947, Serial No. 773,350

4 Claims.

1 This invention relates to machines for sewing together the plies of a fabric or rag buffing wheel, in accordance with which inner and outer annular lines of stitching are connected by stitching in spiral formation, the entire stitching being continuous from end to end. More particularly a the invention relates to the attachment for a sewing machine by means of which the rag wheel is automatically guided to the stitching mechanisms and the feed mechanism of a sewing machine to produce the desired stitching on the buffing wheel material.

One object of the present invention is to provide an attachment for a sewing machine 'provided with improved means actuated by the power feed of the sewing machine for guiding the buffing wheel to perform the stitching operations in the desired pattern.

A further object is to provide such an attachment hingedly supported by the sewing machine so that it may be swung up away from the stitching mechanism for easy placement and removal of the work.

A further object is to provide means for automatically stopping the operation of the machine at the end of the desired cycle of operations.

Further objects and advantages will appear from a description of an embodiment of the invention shown in the accompanying drawings, in

which:

Figure 1 is a fragmentary front elevation of a sewing machine provided with an attachment embodying the invention, the parts being shown in full lines in an intermediate portion of the cycle and in dotted lines in inoperative position. a

Figure 2 is a fragmentary left hand end elevation of the same. 7

Figure 3 is a right hand end elevation to a larger scale and partly broken away of the sewing mechanism applied to the sewing machine.

Figure 4 is a detail sectional view on line 44 of Figure 3.

Figure 5 is an exploded perspective view of a portion of the mechanism drive.

Figure 6 is a detail sectional view on line 6--6 of Figure 4.

Figure 7 is a perspective view of a completed bufling wheel showing the stitching therein.

Figure 8 is a top plan view showing the mechanism and a portion of the sewing machine partly broken away and in section.

Figure 9 is a view similar to a portion of Figure 8, but showing the parts near the end of the machine cycle.

Figures 10 and 11 are detail sectional views on line Ill-J0 of Figure 8 and l l-Il of Figure 9, respectively.

2 Referring first to Figures 1 and 8 of the drawings, at l is shown a, portion of a sewing machine having the head 2 which carries a reciprocating needle bar 3, the head extending over the base portion of the machine in which there is positioned a suitable work feedingmeans shown somewhat diagrammatically at i and driven in time with the motion of the needle bar by an actuating shaft 5. This mechanism may be'of any usual construction and per se forms no part of the present invention.

Fixed to the base of the sewing machine or extending from a table supporting it, is a frame 6 having a bracket 1 at its outer end. On this bracket is adjustably fixed a U-shaped member It, the adjustment comprising screw and slot connections at I I for this U-shaped member with the bracket '5. This member has a pair of spaced ears J2 thereon to which is pivoted a frame comprising an end member i3 and a pair of side bars l4 secured to the member l3 and extending in parallel relation away from the head member 13. The bars it are joined at their outer ends by a transverse member l5 and between the members It and :3 there is slidable on the bars It a carriage !5. This carriage is movable between a stop H adjustable lengthwise of one of the bars 54 and the end plate l5. The carriage It has journaled therein a shaft 28, the intermediate portion of whose'length is threaded to providea lead screw portion 2!. The outer end of this shaft 20 has the threads cut away to form a nonthreaded end portion 22.

As best shown in Figure 4, the inner end of the shaft, which has a bearing in a side frame member of the carriage i6, is of reduced diameter as at 25, and it extends into a multiple gear 26 having the gear portions 2?, 28, 29 and 3B of different diameters arranged along its length. This multiple gear 26 is secured to the shaft 2? as by means of a set screw 3|. The portion extends only part way through the multiple gear 255, leaving room for the outer end of a shaft 35 journaled in the end portion 36 of the carriage and in the multiple gear 26. The shaft 35 is held against axial motion in the carriage It by means or a gear 31 inside of the carriage frame and secured. to the shaft 35, as by means of a set screw 38', and a cylindrical block 39 journaled on the opposite end portion of the shaft 355. This block 39 has a cylindrical portion provided with a notch 15 which extends for somewhat more than one half of its circumference and withinwhich is engaged a screw il carried by the shaft 35. The free end of this block 33 is formed asa bevel gear 42 which meshes with a similar gear 53 on.

the upper end of a cylindrical block 44. This block 44 is also provided with a peripheral slot 45 therein which extends throughout somewhat more than half its circumference, and riding in this slot is a screw 46 threaded into a vertical shaft 41 on which the block 44 is journaled. This shaft 41 is journaled in a horizontal extension 48 of the carriage and has a hollow lower end 49 for the reception of a pointed shank 50 of a center pin This center pin may have a head 52 upon which may be placed superposed disks 55 of cloth to form a buffing or rag" wheel. These cloth plies or disks 53 at their outer edges underlie the needle bar 3 at the start of the sewing operation. The sewing machine feed mechanism, acting against the under face of the lower of these cloth layers, feeds these layers toward the sewing mechanism of the sewing machine, and in so doing, rotates the work pieces about their centers and about the pin 5|. Rotation of the work pieces is employed to rotate the shaft 41. This is done by a collar 410 fixed to the shaft 41, as by means of a set screw 41|, this collar 410 having one or more lengthwise perforations 412 therethrough arranged around the shaft 41 and through which headed pins 415 may be placed, the pointed ends of these pins engaging in the work pieces 53 and being retained therein by a washer 416 overlying their heads and between their heads and the under face of the bracket #8. An advantage obtained by the use of the pins 415 is that they may be removed and replaced easily by the operator without requiring the attention of a service-man. After lost motion has been taken up between the screw 45 and its slot 45 and the screw 40 and its slot 4|, rotation of the work rotates the shaft 35, which, as will later appear, acts to rotate the driven shaft 25 which when its threaded portion is in active position, produces a steering motion of the work transverse to the direction of feed as produced by the sewing machine feed mechanism.

During the first revolution of the work pieces, during which time the lost motion between the screws 4| and 45 and their respective slots is being taken up, the shaft 20 is stationary so that there is no component of feed motion except that produced by the sewing machine feed. This causes the work pieces to be rotated substantially about their centers and the shank '50, and all this action takes place until the stitching mechanism has placed stitching in substantially a complete circle around the outer margins of the work disks.

When this single rotation of the work pieces has been effected, the screws 4| and 46 are brought up against the ends of their respective notches, taking up all the lost motion, so' that further rotation of the shaft 41 drives the drive shaft 35. Driving of the shaft 35' is also made to drive the shaft 20. To this end, the gear '37 on the shaft 35 meshes with a long gear 56 fixed .to a shaft 5| journaled in the carriage IS in parallel relation to the shafts 35 and 25. The shaft 5| also has secured thereto a series of gears .52, 53,, 5'4 and 55, and this shaft 5! may be moved axially while the gear '51 remains in mesh with the gear 50 to bring any selected of the gears '52 to 55into mesh with the gears 35,29, 28 and 21, respectively.

In Figure 8, the gear 55 is shown in mesh with the gear 24 so that rotation of the shaft '35 acts to rotate the shaft 28 at a given rate relative to the rotation of the shaft 35, depending upon the relative size of the gears 55 and 26. Thus, after the lost motion between the screws til and 44,

and their respective slots 4| and 45, has been taken up, which is after a substantially complete rotation of the work disks has taken place, the shaft 20 begins to turn. The threaded portion 2| of this shaft may have engaged therewith a latch 60 pivoted at 5| between bracket elements 62 upstanding from the end member I3. The member is normally held in such engagement, as "shown in Figure 10, by a spring 63, but it may be released by exerting downward pressure on its outer end portion 64. Whi e the latch 50 is in engagement with the threaded bushing 2|, and the shaft 20 is turned, the shaft 20 is caused to move axially as it is rotated, the latch acting as a fixed nut. This causes the shaft 20 with the carriage It, to move along the guide bars 14 toward the end member l5 of the frame and causes the central axis portion of the work to be moved toward the needle bar at a gradual rate so that as the sewing continues the stitching spirals inwardly from the outer circular line made while there was no feed by the carriage because of the taking up of the lost motion in the drive mechanism for the shaft 20, as previously described.

This continues until after a spring bumper 1B, journaled and axially movable in an upward bracket extension 1| of the carriage, strikes against the end frame member l5. Further motion of the carriage then holds back the bumper 10 while the motion of the carriage continues, so that a gear 15 fixed to the bumper is moved axially into mesh with the gear 31 on the drive shaft 35. Further motion of the drive shaft '35 produces a rotation of the gear 15 until a pin 16 projecting therefrom strikes against the lower face of an arm 11, lifting this arm 11 (see Figure 3), and rocking a shaft 18 to which this arm 11 is clamped. This shaft 18 has a crank end portion 19 (see Figures 8 and 10), which, when the shaft 18 is rocked from normal position shown in full lines of Figure 10 to the dotted line position, engages the side of a stop bar 80 and forces this stop bar 80 from the full to the dotted line position shown in Figure 10, releasing a latch lug 8| thereon from a latch plate 82, this releasing the rod 85 for axial motion. A spring 83 (Figure 2) lifts the bar 80 and rocks a rock shaft 830 connected to the bar 80 through an arm 83L The shaft 838 is connected to suitable mechanism (not shown) for stopping the operation of the machine. This maybe a clutch control or other suitable mechanism. At about the time the gear 15 comes into mesh with the gear 31, the threaded portion 2| of the shaft 20 comes out of mesh with the latch 50, which thereupon engages the cylindrical or non threaded end portion 22 so that the shaft '20 is no longer moved axially by its rotation. The stitching, however, continues.

after this portion of the shaft 20 engages the latch 50 until such time as the gear '15 rotates throughout the angular distance necessary to bring the 'pin 16 into position to engage the stop rod and release the machine for stopping. Since during this-part of the rotation of the shaft 20 the carriage It does not move along the guide bars [4, the work pieces merely continue rotation about the shank 5| so that a circular stitching line .is made toward the center of the fabric disks as shown in Figure '7 before the machine stops. The outer circular row of stitching .85 is thus connected to an inner circular row by a continuous line of spiral stitching 81, all of these, however, being made by a single continuous stitching operation of the sewing machine.

The various gears 21 to 39 and 52 to 55 are employed in order to adjust the rate of motion of the carriage it, which thus determines the spacing of adjacent convolutions of the spiral line of stitching. The gears 52 to 55 may be adjusted to the desired position by moving the shaft 5| axially by hand, a pivoted latch plate 89 carried by the carriage It being adapted to rest in any selected of four peripheral grooves 90 spaced along the shaft 5| to retain the shaft 5| in any selected of these axial positions.

The adjustment of the plate l9 determines the size of the inner circular stitching row and the diameter of the outer circular row of stitches 85 is determined by the setting of the stop I! which limits the outward motion of the carriage It to the starting position. The end plate I5 of the frame has fixed thereto a normally horizontal plate 9! by screw and slot connections, this plate 9| having an extension 92 pressed into engagement with the sewing machine head 2 by the thrust of the feeding mechanism on the work.

The pivotal connections of the plate 13 to the plate Iii permit the lifting of the inner end of the frame into the dotted line position shown in Figure 1 out of contact with the work, thus facilitating the insertion and removal of the Work when desired.

From the foregoing description of an embodiment of this invention, it should be evident to those skilled in the art that various changes and modifications might be made without departing from its spirit or scope.

I claim:

1. The combination with a sewing machine having sewing mechanism and means for feeding a plurality of superposed fabric disks to said sewing mechanism, of means for steering said disks relative to said mechanism, and means for driving said steering means comprising a shaft substantially perpendicular to said disks, a collar secured to said shaft and having a perforation eccentric to said shaft, a headed pin carried in said perforation and engageable in said disks, and a member overlying said collar and the head of said pin and retaining said pin in said perforation whereby turning of said disks by said feed mechanism rotates said shaft.

2. The combination with a sewing machine having sewing mechanism and means for feeding a plurality of superposed fabric disks to said sewing mechanism, of means for steering said disks relative to said mechanism, and means for driving said steering means comprising a shaft substantially perpendicular to said disks, a collar secured to said shaft and having a series of perforations arranged around and substantially parallel to said shaft, a headed pin carried in each of said perforations and engageable in said disks, and a disk overlying said collar and the head of said pins and retaining said pins in said perforations, whereby turning of said fabric disks by said feed mechanism rotates said shaft.

3. The combination with a sewing machine having sewing mechanism and means for feeding a plurality of superposed fabric disks to said mechanism, of means driven by the feed of said disks for moving said disks laterally of the feed direction to cause the stitching of said disks to be made in a spiral path, said driving means com prising a carriage mounted for motion transverse to the feed direction, a drive shaft journaled in said carriage, mechanism operative coupling said shaft to be driven by the e of said disks produced by said feeding means, a shaft having threaded and unthreaded portions and driven by said drive shaft, a member on said carriage engageable with said driven shaft eifective when engaging said threaded. portion to cause the rotation of said driven shaft to move said carriage axially of said driven shaft, a gear journaled on said carriage and movable axially, a spring bumper operatively connected to said gear to move said gear axially, a drive gear on said drive shaft with which said carriage gear may be brought axially into mesh when said spring bumper is depressed at the end of the desired extent of motion of said carriage, a sewing mechine control, and an element carried by said carriage gear for actuating said control to stop the machine after a predetermined extent of rotation of said carriage gear after it has meshed with said drive gear and while said engageable member is in engagement with an unthreaded portion of said driven shaft.

4. The combination with a sewing machine having stitching mechanism and mechanism for feeding work comprising a plurality of superposed disks of fabric to said stitching mechanism, of mechanism actuable by the feeding motion of the work for guiding the work to said stitching mechanism to cause said stitching mechanism to stitch the disks in circular fashion adjacent to the outer edges and centers of said disks and in spiral formation therebetween, said actuated mechanism being hingedly mounted spaced from said stitching mechanism for lifting out of contact with the work to facilitate placing and removal of the work with respect to said stitching mechanism and having an element engaging a portion of the sewing machine and pressed thereagainst by the feed imparted to said disks during operation of the sewing machine.

FLOYD H. OGDEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 331,607 Binns Dec. 1, 1885 390,685 Mallett Oct. 9, 1888 393,252 Mallett Nov. 20, 1888 564,598 Diehl July 28, 1896 1,470,932 Perras Oct. 16, 1923

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