US2694375A - Noise and vibration isolating means for sewing machines - Google Patents

Noise and vibration isolating means for sewing machines Download PDF

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Publication number
US2694375A
US2694375A US218815A US21881551A US2694375A US 2694375 A US2694375 A US 2694375A US 218815 A US218815 A US 218815A US 21881551 A US21881551 A US 21881551A US 2694375 A US2694375 A US 2694375A
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frame
cloth plate
machine
plate
opening
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US218815A
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John G Attwood
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Union Special Machine Co
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Union Special Machine Co
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B75/00—Frames, stands, tables, or other furniture adapted to carry sewing machines
    • D05B75/02—Frames, stands, tables, or other furniture adapted to carry sewing machines for drop-head sewing machines

Definitions

  • This invention relates to sewing machines of the industrial type intended for operation at high speeds. It relates more particularly to the mounting and construction of these machines in such a way that noise and vibration are reduced to a minimum.
  • the left-hand bearing for the upper drive shaft, adjacent the needle head of the machine, has also been found to develop a substantial amount of noise and vibration, particularly as the bearing begins to wear or when it is not thoroughly lubricated.
  • the cloth plate is a primary source of objectionable noise and vibration.
  • that imparted to the cloth plate is objectionable because it is transmitted to the hands of the operator and frequently interferes with the proper manipulation of the work.
  • Other parts of all sewing machines are subject to vibration and contribute to the creation of noise but it has been found that those indicated are responsible for the most objectionable noises and vibrations.
  • a peculiarity of noises is that their effect is not additive.
  • three separate sources of noise in a machine should each create a noise power level of x decibels the combined noise of the three sources would not be 3x decibels but merely about x-j-S decibels. Therefore, the elimination of noise from only one of the sources, or even two, would not materially reduce the noise created by the machine.
  • some advantage is gained by eliminating or reducing or absorbing vibrations from any source, since almost any vibration is objectionable for reasons other than the noise which it creates. This, for example, is indicated above in reference to the cloth plate.
  • a primary object of the present invention has been to isolate the cloth plate of a sewing machine effectively from the frame of the machine in such a way as to substantially eliminate, or at least greatly reduce, vibration of tllie cloth plate without producing other objectionable resu ts.
  • Another object has been to so construct a sewing machine, capable of high speed operation, that vibration is eliminated or greatly reduced in connection with all of the parts principally responsible for the creation of noise.
  • the invention contemplates the provision of various expedients capable of minimizing the vibration of certain important parts of the machine, such as the cloth plate and the main drive shaft, and capable of eliminating certain causes of vibration, such as the ordinary gearing commonly provided between upper and lower rotary drive shafts.
  • Fig. l is a View partly in front elevation and partly in vertical section of a sewing machine embodying the in'- vention, a portion of the table top in Whichvthe machine is mounted being shown in section;
  • Fig. 2 is a detail view in axial section through a bearing sleeve embodied in the machine
  • Fig. 3 is an end elevational View of the machine, as seen from the left in Fig. 1, with the cover plate for the needle head removed;
  • Fig. 4 is a bottom plan view of the machine, with portions broken away or shown in horizontal section and with certain bottom plates removed;
  • Fig. 5 is an enlarged vertical sectional View of the lower portion of the machine, taken along the line 5 5 of Fig. 4;
  • Fig. 6 is a top plan view of the machine and a portion of the table on which it is mounted, the major portion of the overhanging arm being broken away;
  • Fig. 7 is a perspective view of the base portion of the frame casting and a part of the vertical standard
  • Fig. 8 is an exploded perspective view of the cloth plate of the machine and certain of the supporting means therefor, a portion of the cloth plate being broken away;
  • Fig. 9 is a vertical sectional view, taken along the axis of the lower drive shaft, showing a portion of a modified form of frame adjacent the lower end of the vertical standard;
  • Fig. 10 is a front elevational view of the right end of a frame embodying a further modification, the cloth plate and certain vibration absorbing means being shown in section;
  • Fig. 1l is a horizontal sectional view taken along the line 11-11 of Fig. l0;
  • Fig. 12 is a vertical sectional view through the left end of the base of a further modied form of frame
  • Fig. 13 is a detail view, in end elevation, of a portion of the structure shown in Fig. l2.
  • the invention has been shown as applied to a lockstitch sewing machine of the type disclosed in the patent to Christensen et al. No. 2,113,572, granted April 12, 1938.
  • the work feeding mechanism is constructed and arranged like that disclosed in the patent to Sauer et al. No. 2,035,508, granted March 31, 1936.
  • the illustrative machine comprises a frame having a base portion 10, a vertical standard 11 extending upwardly from the right end of the base, an overhanging arm 12 projecting laterally from the top of the vertical standard, and a needle head 13 at the outer end of the overhanging arm.
  • a main drive shaft 14 extends longitudinally of the overhanging arm and is journaled adjacent its left end in a bearing sleeve 15, shown in detail in Fig. 2.
  • This sleeve has a portion 15a of slightly enlarged outside diameter having a press iit in an opening extending through a wall between the needle head and the overhanging arm.
  • a slight clearance is provided between the inner surface 15b and the surface of the shaft.
  • the latter has a close bearing fit within a reduced portion 15e of the sleeve.
  • This portion of the sleeve has a clearance in relation to the opening in the wall.
  • the arrangement is such that the sleeve may iiex to a limited extent in response to vibrations of the shaft and these vibrations are absorbed or dampened. Smaller clearance is permitted between the shaft and the bearing surface of the portion 15C than would be required with a conventional bearing sleeve with the result that a lubricant lm may be more eiectively retained.
  • Adjacent its right end of the shaft 14 is journaled in a bushing 16 extending through the end wall of the frame.
  • This bushing may, if desired, be of the same construction as sleeve 15, but this is not essential since the vibrations at the right end of the shaft are substantially less than those at the left end.
  • On the outer end of the shaft there is secured a combined handwheel and pulley 17 through which power may be supplied to the shaft.
  • a pulley 18 secured to the shaft adjacent the bushing 16 is connected by a belt 19 with a pulley 2t) secured to a lower rotary drive shaft 21.
  • Pulleys 18 and 2t are provided with laterally extending grooves adapted to cooperate with clips or ribs or projections on the belt to insure a positive driving connection between the two shafts.
  • Shaft 21 is journaled adjacent its right end in a bearing sleeve 22 and and is journaled toward its left end in bushings 23, 24 and 25 (Fig. 4) carried by portions of the base of the frame.
  • the upper main drive shaft 14 extends into the needle head and carries at its left end a crank member 26 (Figs. l and 3) which is pivotally connected with one end of a link 27. The opposite end of this link is pivotally connected with a pin 28 projecting from a block secured to a needle bar 29. The latter is mounted for vertical reciprocation in bushings 30 and 31 carried by the needle head. At its lower end the needle bar carries a needle 32 which, upon reciprocation of the needle bar, passes downwartny tnrougn me work.
  • a rotary hook comprising a rotary component 33 and a stationary bobbin holder 34 (Figs. 3 and 4).
  • the rotary component is secured to the outer end of a shaft 35 journaled in a bearing sleeve 36 mounted in the base of the frame. Adjacent its inner end the shaft 35 carries a pinion 37 which meshes with a gear 33 on the shaft 21.
  • the arrangement is such that for each revolution of the shaft 21 the shaft 35 is given two revolutions.
  • a fourmotion feed dog 39 (Fig. 3) is provided for advancing the work past the stitching point.
  • This is secured by a screw 40 to the forward end of a feed bar 41 which is rockably mounted, by means of a shaft or pin 42, on a feed rocker 43.
  • the latter is rockably mounted on a fixed shaft 44 suitably mounted in the base of the frame.
  • a socket member 45 (Fig. 4) forming part of a telescoping pitman.
  • the other member of this pitman is a rod 46 slidable within the socket and integrally connected with a strap 47 surrounding an eccentric on the shaft 21.
  • a link 48 having one end pivotally connected with the socket member adjacent its free end and having its other end pivotally connected with an arm 49 secured to a shaft 50.
  • the latter may be rocked to any extent desired, and thereby vary the position of arm 49, by turning a small thumb wheel 51 projecting forwardly from the vertical standard of the frame.
  • the feed dog is lifted and lowered, into and out of engagement with the work, by means of a downwardly extending arm 52, integral with the feed bar 41, which is pivotally connected with the lower end of a pitman 53 having a strap at its upper end surrounding an eccentric or crank element on the end of the shaft 21.
  • a presser foot 54 yieldingly urges the work against the feed dog, as the latter passes upwardly through the throat plate, to assist in the feeding action.
  • This presser foot is secured to the lower end of a presser bar 55 mounted for vertical sliding movement in the needle head. It is urged downwardly by a spring 56 which bears at its lower end against a block 57 secured to the presser bar and at its upper end against the bottom of a screw threaded sleeve 5S.
  • the presser bar may be lifted, whenever desired, to raise the presser foot from the work and facilitate the introduction and removal of work.
  • This is accomplished by means of a collar 59 slidably mounted on the presser bar.
  • Any suitable means may be provided for lifting the collar 59 at the will of the operator.
  • Such means may, for example, be similar to that disclosed in the patent to Smith No. 2,502,350, granted March 28, 1950. It may comprise a link 60 connected at one end with the collar and at its other end with an arm 61 which is carried upwardly upon the downward rocking movement of a pin 62 connected with a rod 63, the latter, in turn, being ⁇ connected with a foot treadle or knee press.
  • a manually operated cam lever 64 may also be provided for lifting the presser bar. The cam portion of this lever cooperates with an arm 59a extending rearwardly from the collar 59.
  • the machine is mounted in a table top 65 having a well or opening 66 adapted to receive the base of the frame with a small clearance completely around the same. It also receives a cloth plate 67 which is connected in a manner to be explained, with the work supporting base portion of the frame. A slight clearance is also provided at all points between the edge of the cloth plate and the wall of the opening 66 but this is less than the clearance between the frame and said wall and is of such character as not to interfere with the proper handling of the work.
  • the arrangement is such that the upper surface of the cloth plate is flush with the top surface of the table.
  • Diagonally disposed shelf members 68 (Fig. 6) extend across the corners of the opening adjacent the left end of the machine frame and these serve to support the left end of the cloth plate by direct engagement therewith.
  • Similar shelves 69 are provided across the corners at the right end of the machine frame. These serve to support either the frame or the cloth plate, in the manner to be explained, depending upon which of the several embodiments of the invention disclosed herein is adopted.
  • the front edge of the cloth plate is tapered slightly adjacent its left end from a suitable point, such as that indicated at 70. This permits the frame of the machine and the cloth plate to skew slightly within the opening 66 as power is supplied to the sewing machine, but it insures that any such skewing will take place about an axis in the region of the vertical standard. When the machine skews, that portion of the edge of the cloth plate between the point 70 and the commencement of the curvature at the front left corner of the plate will engage the vertical wall of the opening 66.
  • the cloth plate extends slightly beyond the front and rear edges of the frame and as shown in Fig. 4 it extends to the left slightly beyond the frame.
  • a rearwardly extending hook or claw 71, integral with the cloth plate, is arranged to be slipped over a hinge pin carried by a disc 72 secured to the table top.
  • a hook or claw 73 integral with the base of the frame of the machine, in the region of the vertical standard, is arranged to be slipped over hinge pin carried by a disc 74 secured to the table top. This arrangement permits the machine to be tilted back, in a manner well known, to expose the parts in the base.
  • the hook 73 is normally held spaced from its hinge pin by the manner in which the machine is mounted on the table; the rear finger of the hook 71 may be brought into engagement with its hinge pin upon skewing of the sewing machine in the manner explained, but due to the proximity to the hook 73 of the axis bout which such skewing takes place, no part of this hook will be forced into contact with its pin. This is important since it insures against transmission of vibrations from the frame to the cloth plate through the table.
  • the right end of the machine frame is supported by the shelves 69 which are formed some distance below the upper surface of the table top.
  • suitable vibration absorbing members or isolators 75 (Figs. 6 and 9) are secured to the corners of the frame by countersunk screws 76.
  • These isolators may be formed of any suitable vibration absorbing material, such as cork, felt, rubber, or the like. The arrangement is such that the lower face of each isolator rests upon the shelf 69 and any vibrations in the machine frame are absorbed and are not transmitted to the table top. As best shown in Fig.
  • the corners of the well or opening in the table top are suitably formed to receive the members 75 and to retain the machine frame in predetermined and substantially fixed relation to the table top. They serve to hold the hook 73 out of engagement with its hinge pin when the machine is in its operating position. However, when the machine is tilted backwardly the hook comes into engagement with and pivots about the hinge pin.
  • the cloth plate of the machine is supported from the table directly at the left end, while the frame of the machine is supported from the table through the isolating means at the right end. Suitable vibration isolating connections are provided between the cloth plate and the frame of the machine at other points.
  • a downwardly extending bracket 77 is provided adjacent the right end of the forward edge of the cloth plate.
  • This bracket has a screw threaded opening which receives the threaded end of a screw stud 78. The latter is pressed into a small cylinder 79 which is retained in any suitable way within an opening 80 in the vertically disposed forward wall 81 of the base of the frame.
  • Member 79 may be formed of natural or synthetic rubber or other suitable vibration absorbing material having the characteristics of yieldability, resilience, elasticity, and the like and capable of preventing the transmission of vibrations between the connected parts.
  • a washer 78a is provided between the head of the screw 78 and the cooperating surface on the member 79.
  • a vibration absorbing connection is also provided between the right rear corner of the cloth plate and the adjacent vertical wall of the machine frame.
  • an L-shaped bracket 82 is secured by screws 83 to the wall 84 of the machine frame.
  • the arrangement is preferably such that slight vertical adjustment is permitted between the bracket 82 and the wall 84.
  • a screw 85 extending through an opening in the horizontal arm of the bracket 82 has threaded engagement with an opening in the cloth plate 67.
  • a sleeve 86 formed of rubber or other vibration absorbing material, of the character indicated above, is provided. This preferably has flange portions extending over the edges of the opening in the bracket member.
  • a washer 87 may be provided between the head of the screw 85 and the lower face of the sleeve 86.
  • a strap member 88 At the right end of the cloth plate there is formed integrally therewith, or otherwise secured thereto, a strap member 88 presenting a shelf 89 some distance below the main part of the cloth plate.
  • a vibration absorbing member 90 formed of rubber or other vibration absorbing material of the type mentioned, is secured to the shelf 89 by a screw 91 the head of which is countersunk in the member 90 so as to eliminate danger of contact with any'part of the frame.
  • a washer 92 may be interposed between the member 90 and the shelf 89. By the selection of a washer of appropriate thickness the top of the member 90 may be located at the proper level to position the throat plate correctly as will appear hereinafter.
  • Flattened faces 93 are provided on the upper portion of the member 90 for cooperation with the side surfaces of a recess or channel 94 provided in the under face of a projection 95 at the left end of the frame.
  • the arrangement is such that the projection 9S rests upon i the vibration absorbing member 90 and through the latter is supported by the shelf 89.
  • the cloth plate and the frame of the machine are interconnected at three points by means capable of absorbing and eliminating the transmission of vibrations from the frame to the cloth plate.
  • the machine as a whole is carried by the table through the direct engagement of the left end of the cloth plate with the shelf portions 68 and through the support of the right end of the frame by the shelf portions 69 through the vibration absorbing members 75.
  • the arrangement is such that the mass of the table is added to that of the cloth plate in resisting vibrations. This makes it possible to employ vibration absorbing elements in the connections between the frame and cloth plate, at the various points indicated, which are relatively rigid, since quite substantial vibrational forces must be transmitted from the frame to set-up joint vibration of the cloth plate and table.
  • the frame of the machine is so formed that the various surfaces 96 at the top of the base portion of the frame, which are directly beneath the cloth plate, are all in the same plane. This facilitates machining of the base of the frame. If the base is formed separately from the vertical standard, as shown in Fig. 9, the at surface indi-y cated at 96a is extended beneath the standard, so that the entire upper surface of the base may be readily machined. It should be noted in connection with Fig. 9 that when this form of frame is employed, the vibration absorbing elements 75 are positioned somewhat lower than in the Fig. 7 embodiment. This is to permit the mounting of the vibration absorbing means on the base of the frame without having the screws 76 project into any part of the separate standard.
  • a horseshoe shaped i so or C-shaped member 97 is applied to the top of the base of the frame in the region of the throat plate, this member having a pair of laterally extending ears 98 which preferably it into corresponding recesses in the top surface of the frame and are secured to the latter by screws 99.
  • Throat plate 100 (Fig.
  • member 97 having suitable slots or openings 101 for the passage of the feed dog and needle, is secured to the member 97 by means of screws 102 which cooperate with threaded openings 103 in member 97.
  • Member 97 may be made available in different thicknesses so that one of appropriate thickness may be selected to insure location of the top of the throat plate 100 in the plane of the upper surface of the cloth plate 67.
  • a slide plate 104 is slidably mounted on ways 106 (Fig. 8) formed at the edges of a Cut away portion at the left end of the cloth plate. Upon removal or outward movement of the plate 104 access is provided to the bobbin case of the rotary hook for the replacement of an empty bobbin by a filled one.
  • a reservoir 107 is provided in thebase of the frame beneath the vertical standard.
  • a bottom plate 108 having a suitable gasket serves to close the bottom of this reservoir but, on removal, permits access to the latter for cleaning and inspection.
  • Belt 19 is of an oil resistant type and is adapted to pass through the oil in the reservoir and assist in distributing the lubricant by creating a mist within the vertical standard.
  • a small reservoir 110 serves to retain lubricant for the pinion 37 and gear 38 through which the rotary hook is driven.
  • Lubricant of a highly refined character suitable for lubrication of the hook raceway, is delivered to the latter from an auxiliary reservoir 112.
  • the latter has a projection 113 extending into the inner bearing for the hook shaft and serves to supply lubricant to an axial bore in the latter, in the manner disclosed in the patent to Attwood No. 2,395,653, granted February 26, 1946.
  • a screw 114 is provided, this having threaded engagement with the top wall of the reservoir.
  • Vibration absorbing gaskets 115 and 116 are provided at the upper and under surfaces of the cloth plate to prevent metal to metal contact between the cloth plate and the reservoir or the screw 114. The danger of transmitting vibrations from the machine frame to the cloth plate is thus eliminated at this point.
  • a gage plug 117 preferably formed of Lucite, serves to indicate the level of the lubricant within the reservoir 112 in the manner disclosed in the patent to Sauer No. 2,301,460, granted November l0, 1942. This plug has a slight clearance in relation to the wall of an opening through the cloth plate to prevent the transmission of vibrations at this point.
  • the adaptor member 97 (Fig. 7), in addition to the function above described of locating the throat plate at the proper level in relation to the cloth plate, serves as a shield or guard around the openings through the throat plate to prevent the discharge of lubricant from the mist beneath the cloth plate on to the stitching threads or the work being stitched. Its projection above the surface 96 of the frame into engagement with the underface of the throat plate provides this added function.
  • Figs. l0 and ll there is shown a modified form of cloth plate and connection between the cloth plate and the main frame of the machine.
  • the modified machine is provided with a cloth plate 118 which at its left end (not shown) is of the same form as that illustrated in Fig. 8. At that end it is supported directly by the shelf members 68 of the table top and it, in turn, supports the left end of the base of the frame through the engagement of the extension 95 of the latter with the vibration isolating member 90.
  • the cloth plate is of dierent construction from that shown in Fig. 8. It extends completely to the right end of the machine where it is provided with a downwardly extending flange 11351 arranged to rest directly uponl the shelf members 69 of the table.
  • An enlarged opening through the cloth plate is arranged to receive a downward extension 119:1 of the vertical standard 119 of the machine frame.
  • This frame is split along the line formed by the lower edge of extension 119a so that the top of a base portion 123 of the frame may be machined at in a single plane.
  • a vibration absorbing member 121 which may suitably be formed of a strip of rubber or other vibration absorbing material, surrounding the projection 119a.
  • Member 121 has a downwardly extending rib 122 which cooperates with the edge of the opening through the cloth plate. This arrangement is such that vibrations developed in the frame of the machine will be absorbed by the member 121 and will not be imparted to the cloth plate.
  • the member 121 though formed of yielding and resilient material may be relatively firm and capable of supporting the load of the adjacent portion of the fratrie, since the mass of the table is added to that of the cloth plate in resisting vibrations.
  • Figs. l2 and 13 there is shown a modified form of connection between the base of the frame and the cloth plate at the left end of the machine.
  • This is in lieu of the projection 95 and shelf S9 with its vibration absorbing element 90.
  • the base 124 of the frame is connected with the cloth plate 125 through a round steel rod 126.
  • One end of the latter is firmly secured in a wall 127 of the frame and its opposite end is slidably received by an opening in a downwardly extending lug 128 secured to the cloth plate.
  • a cantilever etfect is thus provided.
  • This arrangement permits free vibration of the base of the frame both horizontally and vertically but due to the exing and resilience of the rod 126 the vibrations are not imparted to the cloth plate.
  • the machine constructed and mounted in accordance with the invention serves to reduce substantially, if not completely eliminate, the three major causes of noise. Vibrations normally transmitted to the cloth plate are largely absorbed so that little or no vibration of the cloth plate takes place.
  • the vibrations normally produced in the upper rotary shaft are eliminated or damped by the special bearing construction adjacent the needle head which permits a smaller clearance to be provided around the shaft and tends to absorb vibrations.
  • a similar bearing may, if desired, be provided in the region of the vertical standard.
  • the belt connection between the upper and lower shafts is substantially noiseless. Other forms of connection which eliminate play and back lash may serve substantially the same purpose. Thus a set of fiber gears properly formed and wcll lubricated may be made to produce the desired result.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table, and yieldable vibration absorbing connections between said cloth plate and said frame, said frrlne being held out of direct engagement with said ta e.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table, yieldable vibration absorbing connections between said cloth plate and said frame, and yieldable vibration absorbing means between said table and a portion of said frame for supporting the latter.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table and being directly supported at least in part thereby, and yieldable vibration absorbing connections between said cloth plate and said frame, said connections being arranged to support said frame at least in part.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, one end of said cloth plate being in drect engagement with said table and being directly supported thereby, yieldable vibration absorbing means be tween said table and the opposite end of said frame for supporting the latter from said table, and yieldable vibration absorbing connections between said cloth plate and said frame.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, one end of said cloth plate being in direct engagement with said table and being directly supported thereby, yieldable vibration absorbing means between said table and the opposite end of said frame for supporting the latter from said table, and yieldable vibration absorbing connections between said cloth plate and said frame adjacent the opposite ends of said cloth plate. 6.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table and being directly supported at least in part thereby, and yieldable vibration absorbing connections between said cloth plate and said frame, said connections being arranged to support said frame at least in part, said table having an opening in which said cloth plate is fitted and through which a portion of said frame extends, said cloth plate extending beyond the edges of said frame and serving to retain said frame out of engagement with the walls of said opening.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, and yieldable vibration absorbing connections between said cloth plate and said frame.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frarzze, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate being in direct engagement with said extensions and being supported at both ends thereby, and yieldable vibration absorbing connections between said cloth plate and said frame for supporting the latter from said cloth plate.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having one end thereof in direct engagement with a portion of said extensions, yieldable vibration absorbing means secured to said frame at points remote from said end of the cloth plate, said vibration absorbing means being engaged with another portion of said extensions for supporting said frame, and yieldable vibration absorbing connections between said cloth plate and said frame.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, and yieldable vibration absorbing connections between said cloth plate and said frame, said connections including a resilient rod connected adjacent one end thereof with said cloth plate and adjacent the other end thereof with said frame, said rod being free intermediate its ends to enable exing thereof.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having one end thereof in direct engagement with a portion of said extensions, yieldable vibration absorbing means secured to said frame at points remote from said end of the cloth plate, said vibration absorbing means being engaged with another portion of said extensions for supporting said frame, hinge members carried by said table top, complementary hinge members carried by said cloth plate and said frame for cooperation with said first mentioned hinge members to enable said machine to be tilted backwardly on said table top, said frame being normally so supported as to maintain its hinge member out of contact with the related hinge member on said table top, and yieldable
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arragiged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, said cloth plate having only a small clearance in relation to the wall of the opening in said table top and said frame having a greater clearance in relation to the wall of said opening, and yieldable vibration absorbing connections between said cloth plate and said frame.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, said cloth plate having only a small clearance in relation to the wall of the opening in said table top, said clearance increasing gradually toward one end of one of the longitudinal edges of said cloth plate, and said frame having a greater clearance in relation to the wall of said opening than the maximum clearance between said cloth plate and said opening, and yieldable vibration absorbing connections between said cloth plate and said frame.
  • Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, said cloth plate having only a small clearance in relation to the wall of the opening in said table top, the forward edge of said cloth plate being tapered inwardly slightly at the left end thereof to provide a gradually increasing clearance in relation to said opening, and said frame having a greater clearance in relation to the wall of said opening than the maximum clearance between said cloth plate and said opening, and yieldable vibration absorbing connections between said cloth plate and said frame.
  • a sewing machine having a frame with a base, a Vertical standard and an overhanging arm carrying a needle head, stitch forming and work feeding devices carried by said frame, said devices including a reciprocable needle bar, means for operating said devices including a rotary shaft extending longitudinally of said arm into said needle head, connections in said head from said shaft to said needle bar for reciprocating the latter, a flexible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve arranged to flex at its end adjacent said needle bar, a cloth plate arranged to support Work as it is fed by said work feeding devices past said stitch forming devices, a throat plate carried by said cloth plate and arranged to accommodate a needle, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the transmission of vibrations from said frame to said cloth plate.
  • a sewing machine having a frame with a base, a vertical standard and an overhanging arm carrying a needle head, stitch forming and Work feeding devices carried by said frame, means for operating said devices including a rotary shaft extending longitudinally of said arm, a flexible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve having a tight it adjacent one end thereof in said frame and being free to ex in relation to said frame adjacent its other end, said sleeve having a close bearing fit in relation to said shaft at said other end and having a substantial clearance in relation to said shaft at said one end, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the transmission of vibrations from said frame to said cloth plate.
  • a sewing machine having a frame with a base, a vertical standard and an overhanging arm carrying a needle head, stitch forming and work feeding devices carried by said frame, means for operating said devices including a plurality of rotary shafts extending longitudinally of said arm and said base, respectively, noiseless connections between said shafts positioned within said vertical standard, a exible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve having a tight t adjacent one end thereof in said frame and being free to iiex in relation to said frame adjacent its other end, said sleeve having a close bearing t in relation to said shaft at said other end and having a substantial clearance in relation to said shaft at said one end, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, a throat plate carried by said cloth plate and arranged to accommodate a needle, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the transmission of vibrations from said frame
  • a sewing machine having a frame with a base, a vertical standard and an overhanging arm carrying a needle head, stitch forming and work feeding devices carried by said frame, means for operating said devices including a plurality of rotary shafts extending longitudinally of said arm and said base, respectively, a positive drive belt extending through said vertical standard serving to connect said shafts for operation in unison, a tiexible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve having a tight t adjacent one end thereof in said frame and being free to ex in relation to said frame adjacent its other end, said sleeve having a close bearing fit in relation to said shaft at said other end and having a substantial clearance in relation to said shaft at said one end, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, a throat plate carried by said cloth plate and arranged to accommodate a needle, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Vibration Prevention Devices (AREA)

Description

NOV. 16, 1954 1 G, ATTWOOD 2,694,375
NOISE AND VIBRATION ISOLATING MEANS FOR SEWING MACHINES ATTORNEY.
Nov. 16, 1954 J. G. ATTwooD 2,694,375
NOISE AND VIBRATION ISOLATING MEANS FOR SEWING MACHINES Filed April 2, 1951 7 Sheets-Sheet 2 FIG. 3
EN TOR.
BY JOHN G. ATTWOOD ATTORNEY.
Nov. 16, 1954 J. G. ATTWOOD 2,694,375
NOISE AND VIBRATION ISOLATING MEANS FOR SEWING MACHINES ngi IN V EN TOR. JOHVN G. ATTWOOD ATTORNEY.
NOV 15, 1954 J. G. ATTwooD NOISE AND VIBRATION ISOLATING MEANS FOR SEWING MACHINES 7 Sheets-Sheet 4 Filed April 2. 1951 INVEN TOR. JOHN G. ATTWOOD ATTORNEY.
Nov. 16, 1954 J. G. AT1-woon 2,694,375
NOISE AND VIBRTION ISOLATING MEANS FOR SEWING MACHINES Filed April 2, 1951 7 SheebS-Sheeb 5 Y JNVENToR.
JOHN G. ATTwooD ATTORNEY.
Nov. 16, 1954 J. G. ATTWOCD 2,694,375
NOISE AND VIBRATION ISOLATING MEANS FOR SEWING MACHINES INVENTOR.
JOHN G. ATTWOOD ATTORNEY.
Nov. 16, 1954 J. G. ATTwooo 2,694,375
NOISE AND VIBRATION ISOLATING MEANS FOR SEWING MACHINES Filed April 2, 1951 7 Sheets-Sheet 7 IIBQ "-IZO y /'f/ l o M A :z 'y if lU a ,//S
\ f JNVENTOR.
g JOHN GATTWOOD United States Patent() NOISE AND VIBRATION ISOLATING MEANS FOR SEWING MACHINES John G. Attwood, Oak Park, Ill., assignor to Union Special Machine Company, Chicago, Ill., a corporation of Illinois Application April 2, 1951, Serial No. 218,815
18 Claims. (Cl. 112-260) This invention relates to sewing machines of the industrial type intended for operation at high speeds. It relates more particularly to the mounting and construction of these machines in such a way that noise and vibration are reduced to a minimum.
It has been found that objectionable noise and vibration, incident to high speed operation of sewing machines, are principally present in the cloth plate, in the main drive shaft and in the connections between the latter and certain of the driven parts. These diliculties are particularly encountered in machines having a base, a vertical standard and an overhanging arm and having a main, power receiving drive shaft in the overhanging arm which is connected through means within the standard with a rotary shaft in the base. When gearing is provided in the vertical standard for this purpose it has been found to be responsible for a substantial amount of noise and vibration due to the diculty of eliminating play or back lash. The left-hand bearing for the upper drive shaft, adjacent the needle head of the machine, has also been found to develop a substantial amount of noise and vibration, particularly as the bearing begins to wear or when it is not thoroughly lubricated. In practically all machines the cloth plate is a primary source of objectionable noise and vibration. In addition to the annoyance caused by any type of vibration, that imparted to the cloth plate is objectionable because it is transmitted to the hands of the operator and frequently interferes with the proper manipulation of the work. Other parts of all sewing machines are subject to vibration and contribute to the creation of noise but it has been found that those indicated are responsible for the most objectionable noises and vibrations.
A peculiarity of noises is that their effect is not additive. Thus if three separate sources of noise in a machine should each create a noise power level of x decibels the combined noise of the three sources would not be 3x decibels but merely about x-j-S decibels. Therefore, the elimination of noise from only one of the sources, or even two, would not materially reduce the noise created by the machine. Of course, some advantage is gained by eliminating or reducing or absorbing vibrations from any source, since almost any vibration is objectionable for reasons other than the noise which it creates. This, for example, is indicated above in reference to the cloth plate.
One difficulty in the way of eliminating or absorbing vibrations normally delivered to the cloth plate is that the latter is so light that any yieldable, resilient means interposed in the connections between the cloth plate and the machine frame would need to be so readily flexed or compressed that it would yield objectionably in response to any added load, such as the weight or pressure of the hand of the operator.
A primary object of the present invention has been to isolate the cloth plate of a sewing machine effectively from the frame of the machine in such a way as to substantially eliminate, or at least greatly reduce, vibration of tllie cloth plate without producing other objectionable resu ts.
Another object has been to so construct a sewing machine, capable of high speed operation, that vibration is eliminated or greatly reduced in connection with all of the parts principally responsible for the creation of noise. Toward this end the invention contemplates the provision of various expedients capable of minimizing the vibration of certain important parts of the machine, such as the cloth plate and the main drive shaft, and capable of eliminating certain causes of vibration, such as the ordinary gearing commonly provided between upper and lower rotary drive shafts.
Other objects, features and advantages of the invention will appear from the detailed description of certain illustrative forms of the same which will now be given in conjunction with the accompanying drawings, in which:
Fig. l is a View partly in front elevation and partly in vertical section of a sewing machine embodying the in'- vention, a portion of the table top in Whichvthe machine is mounted being shown in section;
Fig. 2 is a detail view in axial section through a bearing sleeve embodied in the machine;
Fig. 3 is an end elevational View of the machine, as seen from the left in Fig. 1, with the cover plate for the needle head removed;
Fig. 4 is a bottom plan view of the machine, with portions broken away or shown in horizontal section and with certain bottom plates removed;
Fig. 5 is an enlarged vertical sectional View of the lower portion of the machine, taken along the line 5 5 of Fig. 4;
Fig. 6 is a top plan view of the machine and a portion of the table on which it is mounted, the major portion of the overhanging arm being broken away;
Fig. 7 is a perspective view of the base portion of the frame casting and a part of the vertical standard;
Fig. 8 is an exploded perspective view of the cloth plate of the machine and certain of the supporting means therefor, a portion of the cloth plate being broken away;
Fig. 9 is a vertical sectional view, taken along the axis of the lower drive shaft, showing a portion of a modified form of frame adjacent the lower end of the vertical standard;
Fig. 10 is a front elevational view of the right end of a frame embodying a further modification, the cloth plate and certain vibration absorbing means being shown in section;
Fig. 1l is a horizontal sectional view taken along the line 11-11 of Fig. l0;
Fig. 12 is a vertical sectional view through the left end of the base of a further modied form of frame, and
Fig. 13 is a detail view, in end elevation, of a portion of the structure shown in Fig. l2.
For purposes of illustration, the invention has been shown as applied to a lockstitch sewing machine of the type disclosed in the patent to Christensen et al. No. 2,113,572, granted April 12, 1938. The work feeding mechanism, however, is constructed and arranged like that disclosed in the patent to Sauer et al. No. 2,035,508, granted March 31, 1936.
Referring to the drawings, the illustrative machine comprises a frame having a base portion 10, a vertical standard 11 extending upwardly from the right end of the base, an overhanging arm 12 projecting laterally from the top of the vertical standard, and a needle head 13 at the outer end of the overhanging arm. A main drive shaft 14 extends longitudinally of the overhanging arm and is journaled adjacent its left end in a bearing sleeve 15, shown in detail in Fig. 2. This sleeve has a portion 15a of slightly enlarged outside diameter having a press iit in an opening extending through a wall between the needle head and the overhanging arm. A slight clearance is provided between the inner surface 15b and the surface of the shaft. The latter has a close bearing fit within a reduced portion 15e of the sleeve. This portion of the sleeve has a clearance in relation to the opening in the wall. The arrangement is such that the sleeve may iiex to a limited extent in response to vibrations of the shaft and these vibrations are absorbed or dampened. Smaller clearance is permitted between the shaft and the bearing surface of the portion 15C than would be required with a conventional bearing sleeve with the result that a lubricant lm may be more eiectively retained.
Adjacent its right end of the shaft 14 is journaled in a bushing 16 extending through the end wall of the frame. This bushing may, if desired, be of the same construction as sleeve 15, but this is not essential since the vibrations at the right end of the shaft are substantially less than those at the left end. On the outer end of the shaft there is secured a combined handwheel and pulley 17 through which power may be supplied to the shaft. A pulley 18 secured to the shaft adjacent the bushing 16 is connected by a belt 19 with a pulley 2t) secured to a lower rotary drive shaft 21. Pulleys 18 and 2t) are provided with laterally extending grooves adapted to cooperate with clips or ribs or projections on the belt to insure a positive driving connection between the two shafts. Shaft 21 is journaled adjacent its right end in a bearing sleeve 22 and and is journaled toward its left end in bushings 23, 24 and 25 (Fig. 4) carried by portions of the base of the frame.
The upper main drive shaft 14 extends into the needle head and carries at its left end a crank member 26 (Figs. l and 3) which is pivotally connected with one end of a link 27. The opposite end of this link is pivotally connected with a pin 28 projecting from a block secured to a needle bar 29. The latter is mounted for vertical reciprocation in bushings 30 and 31 carried by the needle head. At its lower end the needle bar carries a needle 32 which, upon reciprocation of the needle bar, passes downwartny tnrougn me work.
Cooperating with the needle beneath the work, to form lock stitches, is a rotary hook comprising a rotary component 33 and a stationary bobbin holder 34 (Figs. 3 and 4). The rotary component is secured to the outer end of a shaft 35 journaled in a bearing sleeve 36 mounted in the base of the frame. Adjacent its inner end the shaft 35 carries a pinion 37 which meshes with a gear 33 on the shaft 21. The arrangement is such that for each revolution of the shaft 21 the shaft 35 is given two revolutions.
For advancing the work past the stitching point a fourmotion feed dog 39 (Fig. 3) is provided. This is secured by a screw 40 to the forward end of a feed bar 41 which is rockably mounted, by means of a shaft or pin 42, on a feed rocker 43. The latter is rockably mounted on a fixed shaft 44 suitably mounted in the base of the frame. Pivotally connected with the feed rocker 43 is a socket member 45 (Fig. 4) forming part of a telescoping pitman. The other member of this pitman is a rod 46 slidable within the socket and integrally connected with a strap 47 surrounding an eccentric on the shaft 21. For controlling the movements of the socket member 45 and determining the extent of rocking movements imparted thereby to the feed rocker 43, there is provided a link 48 having one end pivotally connected with the socket member adjacent its free end and having its other end pivotally connected with an arm 49 secured to a shaft 50. The latter may be rocked to any extent desired, and thereby vary the position of arm 49, by turning a small thumb wheel 51 projecting forwardly from the vertical standard of the frame. For further details as to the construction and operation of this mechanism, reference may be had to the Sauer et al. patent mentioned above. The feed dog is lifted and lowered, into and out of engagement with the work, by means of a downwardly extending arm 52, integral with the feed bar 41, which is pivotally connected with the lower end of a pitman 53 having a strap at its upper end surrounding an eccentric or crank element on the end of the shaft 21. A presser foot 54 yieldingly urges the work against the feed dog, as the latter passes upwardly through the throat plate, to assist in the feeding action. This presser foot is secured to the lower end of a presser bar 55 mounted for vertical sliding movement in the needle head. It is urged downwardly by a spring 56 which bears at its lower end against a block 57 secured to the presser bar and at its upper end against the bottom of a screw threaded sleeve 5S. Rotation of the latter provides for adjustment of the tension of the spring. The presser bar may be lifted, whenever desired, to raise the presser foot from the work and facilitate the introduction and removal of work. This is accomplished by means of a collar 59 slidably mounted on the presser bar. Any suitable means may be provided for lifting the collar 59 at the will of the operator. Such means may, for example, be similar to that disclosed in the patent to Smith No. 2,502,350, granted March 28, 1950. It may comprise a link 60 connected at one end with the collar and at its other end with an arm 61 which is carried upwardly upon the downward rocking movement of a pin 62 connected with a rod 63, the latter, in turn, being` connected with a foot treadle or knee press. A manually operated cam lever 64 may also be provided for lifting the presser bar. The cam portion of this lever cooperates with an arm 59a extending rearwardly from the collar 59.
The machine is mounted in a table top 65 having a well or opening 66 adapted to receive the base of the frame with a small clearance completely around the same. It also receives a cloth plate 67 which is connected in a manner to be explained, with the work supporting base portion of the frame. A slight clearance is also provided at all points between the edge of the cloth plate and the wall of the opening 66 but this is less than the clearance between the frame and said wall and is of such character as not to interfere with the proper handling of the work. The arrangement is such that the upper surface of the cloth plate is flush with the top surface of the table. Diagonally disposed shelf members 68 (Fig. 6) extend across the corners of the opening adjacent the left end of the machine frame and these serve to support the left end of the cloth plate by direct engagement therewith. Similar shelves 69 are provided across the corners at the right end of the machine frame. These serve to support either the frame or the cloth plate, in the manner to be explained, depending upon which of the several embodiments of the invention disclosed herein is adopted. The front edge of the cloth plate is tapered slightly adjacent its left end from a suitable point, such as that indicated at 70. This permits the frame of the machine and the cloth plate to skew slightly within the opening 66 as power is supplied to the sewing machine, but it insures that any such skewing will take place about an axis in the region of the vertical standard. When the machine skews, that portion of the edge of the cloth plate between the point 70 and the commencement of the curvature at the front left corner of the plate will engage the vertical wall of the opening 66. This occurs before any part of the frame proper of the machine engages the table. As best indicated in Fig. 5, the cloth plate extends slightly beyond the front and rear edges of the frame and as shown in Fig. 4 it extends to the left slightly beyond the frame. A rearwardly extending hook or claw 71, integral with the cloth plate, is arranged to be slipped over a hinge pin carried by a disc 72 secured to the table top. Similarly, a hook or claw 73 integral with the base of the frame of the machine, in the region of the vertical standard, is arranged to be slipped over hinge pin carried by a disc 74 secured to the table top. This arrangement permits the machine to be tilted back, in a manner well known, to expose the parts in the base. However, it should be observed that the hook 73 is normally held spaced from its hinge pin by the manner in which the machine is mounted on the table; the rear finger of the hook 71 may be brought into engagement with its hinge pin upon skewing of the sewing machine in the manner explained, but due to the proximity to the hook 73 of the axis bout which such skewing takes place, no part of this hook will be forced into contact with its pin. This is important since it insures against transmission of vibrations from the frame to the cloth plate through the table.
As above mentioned, the right end of the machine frame is supported by the shelves 69 which are formed some distance below the upper surface of the table top. To isolate the vibrations of the machine frame from the table at these supporting shelves, suitable vibration absorbing members or isolators 75 (Figs. 6 and 9) are secured to the corners of the frame by countersunk screws 76. These isolators may be formed of any suitable vibration absorbing material, such as cork, felt, rubber, or the like. The arrangement is such that the lower face of each isolator rests upon the shelf 69 and any vibrations in the machine frame are absorbed and are not transmitted to the table top. As best shown in Fig. 6, the corners of the well or opening in the table top are suitably formed to receive the members 75 and to retain the machine frame in predetermined and substantially fixed relation to the table top. They serve to hold the hook 73 out of engagement with its hinge pin when the machine is in its operating position. However, when the machine is tilted backwardly the hook comes into engagement with and pivots about the hinge pin.
As will be seen from the foregoing, the cloth plate of the machine is supported from the table directly at the left end, while the frame of the machine is supported from the table through the isolating means at the right end. Suitable vibration isolating connections are provided between the cloth plate and the frame of the machine at other points. Thus, as best shown in Figs. 5 and 8, a downwardly extending bracket 77 is provided adjacent the right end of the forward edge of the cloth plate. This bracket has a screw threaded opening which receives the threaded end of a screw stud 78. The latter is pressed into a small cylinder 79 which is retained in any suitable way within an opening 80 in the vertically disposed forward wall 81 of the base of the frame. Member 79 may be formed of natural or synthetic rubber or other suitable vibration absorbing material having the characteristics of yieldability, resilience, elasticity, and the like and capable of preventing the transmission of vibrations between the connected parts. A washer 78a is provided between the head of the screw 78 and the cooperating surface on the member 79.
A vibration absorbing connection is also provided between the right rear corner of the cloth plate and the adjacent vertical wall of the machine frame. For this purpose an L-shaped bracket 82 is secured by screws 83 to the wall 84 of the machine frame. The arrangement is preferably such that slight vertical adjustment is permitted between the bracket 82 and the wall 84. A screw 85 extending through an opening in the horizontal arm of the bracket 82 has threaded engagement with an opening in the cloth plate 67. To avoid metal to metal contact between the screw 85 and the bracket 82 a sleeve 86 formed of rubber or other vibration absorbing material, of the character indicated above, is provided. This preferably has flange portions extending over the edges of the opening in the bracket member. A washer 87 may be provided between the head of the screw 85 and the lower face of the sleeve 86.
At the right end of the cloth plate there is formed integrally therewith, or otherwise secured thereto, a strap member 88 presenting a shelf 89 some distance below the main part of the cloth plate. A vibration absorbing member 90, formed of rubber or other vibration absorbing material of the type mentioned, is secured to the shelf 89 by a screw 91 the head of which is countersunk in the member 90 so as to eliminate danger of contact with any'part of the frame. A washer 92 may be interposed between the member 90 and the shelf 89. By the selection of a washer of appropriate thickness the top of the member 90 may be located at the proper level to position the throat plate correctly as will appear hereinafter. Flattened faces 93 are provided on the upper portion of the member 90 for cooperation with the side surfaces of a recess or channel 94 provided in the under face of a projection 95 at the left end of the frame.
The arrangement is such that the projection 9S rests upon i the vibration absorbing member 90 and through the latter is supported by the shelf 89. Thus, it will be seen that the cloth plate and the frame of the machine are interconnected at three points by means capable of absorbing and eliminating the transmission of vibrations from the frame to the cloth plate. The machine as a whole is carried by the table through the direct engagement of the left end of the cloth plate with the shelf portions 68 and through the support of the right end of the frame by the shelf portions 69 through the vibration absorbing members 75. The arrangement is such that the mass of the table is added to that of the cloth plate in resisting vibrations. This makes it possible to employ vibration absorbing elements in the connections between the frame and cloth plate, at the various points indicated, which are relatively rigid, since quite substantial vibrational forces must be transmitted from the frame to set-up joint vibration of the cloth plate and table.
Referring particularly to Fig. 7, it will be noted that the frame of the machine is so formed that the various surfaces 96 at the top of the base portion of the frame, which are directly beneath the cloth plate, are all in the same plane. This facilitates machining of the base of the frame. If the base is formed separately from the vertical standard, as shown in Fig. 9, the at surface indi-y cated at 96a is extended beneath the standard, so that the entire upper surface of the base may be readily machined. It should be noted in connection with Fig. 9 that when this form of frame is employed, the vibration absorbing elements 75 are positioned somewhat lower than in the Fig. 7 embodiment. This is to permit the mounting of the vibration absorbing means on the base of the frame without having the screws 76 project into any part of the separate standard. When this arrangement is employed the recesses in the table top into which the elements 75 are inserted are correspondingly deeper, and the shelf members 69 are lower, so as to permit the top of the cloth plate to be positioned substantially flush with the top of the table. Returning to Fig. 7, a horseshoe shaped i so or C-shaped member 97 is applied to the top of the base of the frame in the region of the throat plate, this member having a pair of laterally extending ears 98 which preferably it into corresponding recesses in the top surface of the frame and are secured to the latter by screws 99. Throat plate 100 (Fig. 6), having suitable slots or openings 101 for the passage of the feed dog and needle, is secured to the member 97 by means of screws 102 which cooperate with threaded openings 103 in member 97. Member 97 may be made available in different thicknesses so that one of appropriate thickness may be selected to insure location of the top of the throat plate 100 in the plane of the upper surface of the cloth plate 67. A slide plate 104 is slidably mounted on ways 106 (Fig. 8) formed at the edges of a Cut away portion at the left end of the cloth plate. Upon removal or outward movement of the plate 104 access is provided to the bobbin case of the rotary hook for the replacement of an empty bobbin by a filled one.
Provision is made for lubrication of the various operating parts. Thus, as shown in Fig. l, a reservoir 107 is provided in thebase of the frame beneath the vertical standard. A bottom plate 108 having a suitable gasket serves to close the bottom of this reservoir but, on removal, permits access to the latter for cleaning and inspection. Belt 19 is of an oil resistant type and is adapted to pass through the oil in the reservoir and assist in distributing the lubricant by creating a mist within the vertical standard. Some of the lubricant from the -rnist is collected by a member 109 which serves to direct a portion of it into an axial bore through the drive shaft 21 for the lubrication of various bearings for this shaft and certain parts driven by it. A small reservoir 110, closed by a removable bottom plate 111, serves to retain lubricant for the pinion 37 and gear 38 through which the rotary hook is driven. Lubricant of a highly refined character, suitable for lubrication of the hook raceway, is delivered to the latter from an auxiliary reservoir 112. The latter has a projection 113 extending into the inner bearing for the hook shaft and serves to supply lubricant to an axial bore in the latter, in the manner disclosed in the patent to Attwood No. 2,395,653, granted February 26, 1946. For retaining the opposite end of the reservoir 112 a screw 114 is provided, this having threaded engagement with the top wall of the reservoir. Vibration absorbing gaskets 115 and 116, formed of rubber or the like, are provided at the upper and under surfaces of the cloth plate to prevent metal to metal contact between the cloth plate and the reservoir or the screw 114. The danger of transmitting vibrations from the machine frame to the cloth plate is thus eliminated at this point. A gage plug 117, preferably formed of Lucite, serves to indicate the level of the lubricant within the reservoir 112 in the manner disclosed in the patent to Sauer No. 2,301,460, granted November l0, 1942. This plug has a slight clearance in relation to the wall of an opening through the cloth plate to prevent the transmission of vibrations at this point.
The adaptor member 97 (Fig. 7), in addition to the function above described of locating the throat plate at the proper level in relation to the cloth plate, serves as a shield or guard around the openings through the throat plate to prevent the discharge of lubricant from the mist beneath the cloth plate on to the stitching threads or the work being stitched. Its projection above the surface 96 of the frame into engagement with the underface of the throat plate provides this added function.
In Figs. l0 and ll there is shown a modified form of cloth plate and connection between the cloth plate and the main frame of the machine. The modified machine is provided with a cloth plate 118 which at its left end (not shown) is of the same form as that illustrated in Fig. 8. At that end it is supported directly by the shelf members 68 of the table top and it, in turn, supports the left end of the base of the frame through the engagement of the extension 95 of the latter with the vibration isolating member 90. At the right end, however, the cloth plate is of dierent construction from that shown in Fig. 8. It extends completely to the right end of the machine where it is provided with a downwardly extending flange 11351 arranged to rest directly uponl the shelf members 69 of the table. An enlarged opening through the cloth plate is arranged to receive a downward extension 119:1 of the vertical standard 119 of the machine frame. This frame is split along the line formed by the lower edge of extension 119a so that the top of a base portion 123 of the frame may be machined at in a single plane. Suitable bolts or screws mounted in openings 123 in inwardly extending bosses at the bottom of the extension 119:1 of the vertical standard, and corresponding bosses provided on the base 120, serve to couple these parts of the frame together. lnterposed between a shoulder 119b at the bottom of the vertical standard and the top of the cloth plate 118 is a vibration absorbing member 121, which may suitably be formed of a strip of rubber or other vibration absorbing material, surrounding the projection 119a. Member 121 has a downwardly extending rib 122 which cooperates with the edge of the opening through the cloth plate. This arrangement is such that vibrations developed in the frame of the machine will be absorbed by the member 121 and will not be imparted to the cloth plate. As indicated above, the member 121 though formed of yielding and resilient material may be relatively firm and capable of supporting the load of the adjacent portion of the fratrie, since the mass of the table is added to that of the cloth plate in resisting vibrations.
Referring now to Figs. l2 and 13, there is shown a modified form of connection between the base of the frame and the cloth plate at the left end of the machine. This is in lieu of the projection 95 and shelf S9 with its vibration absorbing element 90. As shown, the base 124 of the frame is connected with the cloth plate 125 through a round steel rod 126. One end of the latter is firmly secured in a wall 127 of the frame and its opposite end is slidably received by an opening in a downwardly extending lug 128 secured to the cloth plate. A cantilever etfect is thus provided. This arrangement permits free vibration of the base of the frame both horizontally and vertically but due to the exing and resilience of the rod 126 the vibrations are not imparted to the cloth plate. They are absorbed by the steel rod in much the same manner as the vibrations are absorbed by the element 90 of Fig. 8. Adequate clearance is provided between the top surface of the base and the under surface of the cloth plate to permit these vibrations. A clearance of about 1/16 of an inch has been found adequate with a spring rod of sufficient length and resistance to flexure. As in the first embodiment described, the cloth plate rests directly upon the shelf members at the corners of the opening in the table and the base of the frame is of such dimension that it will at no time come in contact with the table. This modified arrangement at the left end of the machine may be used either in connection with the first embodiment described or in connection with that illustrated in Figs. l and 1l.
It will be noted that the machine constructed and mounted in accordance with the invention serves to reduce substantially, if not completely eliminate, the three major causes of noise. Vibrations normally transmitted to the cloth plate are largely absorbed so that little or no vibration of the cloth plate takes place. The vibrations normally produced in the upper rotary shaft are eliminated or damped by the special bearing construction adjacent the needle head which permits a smaller clearance to be provided around the shaft and tends to absorb vibrations. A similar bearing may, if desired, be provided in the region of the vertical standard. The belt connection between the upper and lower shafts is substantially noiseless. Other forms of connection which eliminate play and back lash may serve substantially the same purpose. Thus a set of fiber gears properly formed and wcll lubricated may be made to produce the desired result.
While a preferred form of the invention and various modifications have been described in considerable detail, it will be understood that various further changes may be made in the construction and arrangement of the several parts without departing from the principles and scope of the invention as defined by the appended claims. Other noise and vibration eliminating or absorbing expedients may be employed in addition to or in lieu of certain of those hereinabove described.
What is claimed is:
1. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table, and yieldable vibration absorbing connections between said cloth plate and said frame, said frrlne being held out of direct engagement with said ta e.
2. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table, yieldable vibration absorbing connections between said cloth plate and said frame, and yieldable vibration absorbing means between said table and a portion of said frame for supporting the latter.
3. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table and being directly supported at least in part thereby, and yieldable vibration absorbing connections between said cloth plate and said frame, said connections being arranged to support said frame at least in part.
4. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, one end of said cloth plate being in drect engagement with said table and being directly supported thereby, yieldable vibration absorbing means be tween said table and the opposite end of said frame for supporting the latter from said table, and yieldable vibration absorbing connections between said cloth plate and said frame.
5. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, one end of said cloth plate being in direct engagement with said table and being directly supported thereby, yieldable vibration absorbing means between said table and the opposite end of said frame for supporting the latter from said table, and yieldable vibration absorbing connections between said cloth plate and said frame adjacent the opposite ends of said cloth plate. 6. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said cloth plate being in direct engagement with said table and being directly supported at least in part thereby, and yieldable vibration absorbing connections between said cloth plate and said frame, said connections being arranged to support said frame at least in part, said table having an opening in which said cloth plate is fitted and through which a portion of said frame extends, said cloth plate extending beyond the edges of said frame and serving to retain said frame out of engagement with the walls of said opening.
7. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, and yieldable vibration absorbing connections between said cloth plate and said frame.
8. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frarzze, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate being in direct engagement with said extensions and being supported at both ends thereby, and yieldable vibration absorbing connections between said cloth plate and said frame for supporting the latter from said cloth plate.
9. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having one end thereof in direct engagement with a portion of said extensions, yieldable vibration absorbing means secured to said frame at points remote from said end of the cloth plate, said vibration absorbing means being engaged with another portion of said extensions for supporting said frame, and yieldable vibration absorbing connections between said cloth plate and said frame.
l0. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, and yieldable vibration absorbing connections between said cloth plate and said frame, said connections including a resilient rod connected adjacent one end thereof with said cloth plate and adjacent the other end thereof with said frame, said rod being free intermediate its ends to enable exing thereof.
1l. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having one end thereof in direct engagement with a portion of said extensions, yieldable vibration absorbing means secured to said frame at points remote from said end of the cloth plate, said vibration absorbing means being engaged with another portion of said extensions for supporting said frame, hinge members carried by said table top, complementary hinge members carried by said cloth plate and said frame for cooperation with said first mentioned hinge members to enable said machine to be tilted backwardly on said table top, said frame being normally so supported as to maintain its hinge member out of contact with the related hinge member on said table top, and yieldable vibration absorbing connections between said cloth plate and said frame.
12. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arragiged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, said cloth plate having only a small clearance in relation to the wall of the opening in said table top and said frame having a greater clearance in relation to the wall of said opening, and yieldable vibration absorbing connections between said cloth plate and said frame.
13. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, said cloth plate having only a small clearance in relation to the wall of the opening in said table top, said clearance increasing gradually toward one end of one of the longitudinal edges of said cloth plate, and said frame having a greater clearance in relation to the wall of said opening than the maximum clearance between said cloth plate and said opening, and yieldable vibration absorbing connections between said cloth plate and said frame.
14. Apparatus of the class described comprising a sewing machine and a table for supporting the same, said machine having a main frame, stitch forming and work feeding devices and means for operating said devices carried by said frame, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, said table having a top provided with an opening arranged to receive said cloth plate and through which a portion of said frame extends below said cloth plate, said table top having shelf-like extensions within said opening for supporting said machine, said cloth plate having at least one end thereof in direct engagement with said extensions, said cloth plate having only a small clearance in relation to the wall of the opening in said table top, the forward edge of said cloth plate being tapered inwardly slightly at the left end thereof to provide a gradually increasing clearance in relation to said opening, and said frame having a greater clearance in relation to the wall of said opening than the maximum clearance between said cloth plate and said opening, and yieldable vibration absorbing connections between said cloth plate and said frame.
15. A sewing machine having a frame with a base, a Vertical standard and an overhanging arm carrying a needle head, stitch forming and work feeding devices carried by said frame, said devices including a reciprocable needle bar, means for operating said devices including a rotary shaft extending longitudinally of said arm into said needle head, connections in said head from said shaft to said needle bar for reciprocating the latter, a flexible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve arranged to flex at its end adjacent said needle bar, a cloth plate arranged to support Work as it is fed by said work feeding devices past said stitch forming devices, a throat plate carried by said cloth plate and arranged to accommodate a needle, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the transmission of vibrations from said frame to said cloth plate.
16. A sewing machine having a frame with a base, a vertical standard and an overhanging arm carrying a needle head, stitch forming and Work feeding devices carried by said frame, means for operating said devices including a rotary shaft extending longitudinally of said arm, a flexible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve having a tight it adjacent one end thereof in said frame and being free to ex in relation to said frame adjacent its other end, said sleeve having a close bearing fit in relation to said shaft at said other end and having a substantial clearance in relation to said shaft at said one end, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the transmission of vibrations from said frame to said cloth plate.
17. A sewing machine having a frame with a base, a vertical standard and an overhanging arm carrying a needle head, stitch forming and work feeding devices carried by said frame, means for operating said devices including a plurality of rotary shafts extending longitudinally of said arm and said base, respectively, noiseless connections between said shafts positioned within said vertical standard, a exible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve having a tight t adjacent one end thereof in said frame and being free to iiex in relation to said frame adjacent its other end, said sleeve having a close bearing t in relation to said shaft at said other end and having a substantial clearance in relation to said shaft at said one end, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, a throat plate carried by said cloth plate and arranged to accommodate a needle, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the transmission of vibrations from said frame to said cloth plate.
18. A sewing machine having a frame with a base, a vertical standard and an overhanging arm carrying a needle head, stitch forming and work feeding devices carried by said frame, means for operating said devices including a plurality of rotary shafts extending longitudinally of said arm and said base, respectively, a positive drive belt extending through said vertical standard serving to connect said shafts for operation in unison, a tiexible, vibration dampening bearing for said shaft adjacent said needle head, said bearing comprising a sleeve having a tight t adjacent one end thereof in said frame and being free to ex in relation to said frame adjacent its other end, said sleeve having a close bearing fit in relation to said shaft at said other end and having a substantial clearance in relation to said shaft at said one end, a cloth plate arranged to support work as it is fed by said work feeding devices past said stitch forming devices, a throat plate carried by said cloth plate and arranged to accommodate a needle, and means connecting said cloth plate with said frame, said connecting means including vibration absorbing means arranged to eliminate substantially the transmission of vibrations from said frame to said cloth plate.
References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 2,305,343 Gadbois Dec. 15, 1942 2,325,928 Zeier Aug. 3, 1943 2,484,793 Nissen Oct. 11, 1949 2,500,731 Zeier Mar. 14, 1950
US218815A 1951-04-02 1951-04-02 Noise and vibration isolating means for sewing machines Expired - Lifetime US2694375A (en)

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GB7824/52A GB709540A (en) 1951-04-02 1952-03-27 Improvement in noise and vibration isolating means for sewing machines

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Cited By (5)

* Cited by examiner, † Cited by third party
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US2883955A (en) * 1955-05-24 1959-04-28 Singer Mfg Co Noise vibration damping for sewing machines
US2941490A (en) * 1956-11-28 1960-06-21 Union Special Machine Co Sewing machine supporting and positioning means
US8997669B1 (en) 2014-10-16 2015-04-07 Handi Quilter, Inc. Thread tensioner for a sewing machine
US9394639B2 (en) 2014-10-16 2016-07-19 Handi Quilter, Inc. Motorized thread tensioner for a sewing machine
US9809912B2 (en) * 2014-10-16 2017-11-07 Handi Quilter, Inc. Vibration reduction mechanism for a sewing machine

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US2305343A (en) * 1939-08-09 1942-12-15 Helen M Gadbois Work support for portable electric sewing machines
US2325928A (en) * 1939-04-15 1943-08-03 Singer Mfg Co Sewing machine frame
US2484793A (en) * 1946-01-10 1949-10-11 Singer Mfg Co Overload release mechanism
US2500731A (en) * 1945-09-25 1950-03-14 Singer Mfg Co Throat plate for sewing machines

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Publication number Priority date Publication date Assignee Title
US2325928A (en) * 1939-04-15 1943-08-03 Singer Mfg Co Sewing machine frame
US2305343A (en) * 1939-08-09 1942-12-15 Helen M Gadbois Work support for portable electric sewing machines
US2500731A (en) * 1945-09-25 1950-03-14 Singer Mfg Co Throat plate for sewing machines
US2484793A (en) * 1946-01-10 1949-10-11 Singer Mfg Co Overload release mechanism

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2883955A (en) * 1955-05-24 1959-04-28 Singer Mfg Co Noise vibration damping for sewing machines
US2941490A (en) * 1956-11-28 1960-06-21 Union Special Machine Co Sewing machine supporting and positioning means
US8997669B1 (en) 2014-10-16 2015-04-07 Handi Quilter, Inc. Thread tensioner for a sewing machine
US9394639B2 (en) 2014-10-16 2016-07-19 Handi Quilter, Inc. Motorized thread tensioner for a sewing machine
US9809912B2 (en) * 2014-10-16 2017-11-07 Handi Quilter, Inc. Vibration reduction mechanism for a sewing machine

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