US3587491A - Cam removal unit - Google Patents

Cam removal unit Download PDF

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Publication number
US3587491A
US3587491A US34036A US3587491DA US3587491A US 3587491 A US3587491 A US 3587491A US 34036 A US34036 A US 34036A US 3587491D A US3587491D A US 3587491DA US 3587491 A US3587491 A US 3587491A
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US
United States
Prior art keywords
cam
pattern
plunger
levers
central hub
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US34036A
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English (en)
Inventor
Louis Fawcett Daman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Singer Co
Original Assignee
Singer Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Singer Co filed Critical Singer Co
Application granted granted Critical
Publication of US3587491A publication Critical patent/US3587491A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines

Definitions

  • ABSTRACT A pattern cam removal device for a zigzag sewin; machine which provides for the elevation of a plunger in response to the manual depression of a pattern cam on a cam seat and for the elevation of the pattern cam upon manual depression of the plunger.
  • the handle is in the form of a boss and sometimes amounts to a threequarter inch projection.
  • the packaging and storage of approximately 16 cams each with such handle could result in a package about 16 inches long whereas if these handle projections could be eliminated then a package 4 inches long could be utilized and therefore result in a space savings desirable to the consumer.
  • a sewing machine having a jogging or laterally oscillatory needle controlled by a pattern cam mounted on a camshaft, is provided with a cam removal mechanism incorporated into the upper portion of the camshaft.
  • the cam removal mechanism mounted upon a camshaft which may have a stack of permanently mounted cams thereon, is comprised of a base flange with an axially bored central hub rising therefrom about which is mounted an exchangeable pattern cam.
  • the mechanism includes a pair of diametrically disposed ejection levers which partially seat in a clearance groove formed in the base flange and partially extend through a cutout formed in the central hub until they contact a plunger which is slidably mounted in the axial bore of the central hub. Depression of an exchangeable pattern cam onto the central hub forces the ejection levers down to the base flange and also because of the contact of the levers with the plunger, forces the plunger upward by the action of the lever on the plunger. When the plunger is depressed the opposite action occurs in that the plungers downward force raises the ejection levers which in turn ejects the exchangeable cam off of the central hub.
  • a spring ball mechanism releasably retains the plunger in either an elevated position or a depressed position by engaging detents formed in the sides of the plunger shaft.
  • These retaining levers lock an exchangeable pattern cam on the central hub until released by the action of the plunger I OBJECTS OF THE INVENTION It is an object of this invention to facilitate the exchange of pattern cams by providing a pop-up cam removal device.
  • FIG. 1 is a perspective view of a sewing machine bracket arm showing needle jogging pattern control cam in operative position and having this invention applied thereto;
  • FIG. 2 is a top plan view of the sewing machine pattern camshaft with the cam removed and showing mechanism of this invention
  • FIG. 3 is an elevational view of the camshaft and cam removal mechanism of FIG. 2 along line 3-3 of FIG. 2 to show one of the ejector bellcrank levers in position when a cam seated on the base flange;
  • FIG. 4 is a fragmentary view similar to that of FIG. 3 showing the position of one of the ejector bellcrank levers after a cam has been unseated by depression of the plunger;
  • FIG. 5 is an elevational view of the camshaft and cam removal mechanism of FIG. 2 sectioned along line 5-5 of FIG. 2, to show the position of the retaining lever when the cam is seated on the base flange;
  • FIG. 6 is a fragmentary view similar to that of FIG. 5 showing the position of the retaining lever after the cam has been unseated by depression of the plunger, and
  • FIG. 7 is a perspective view of the underside of the cam removal mechanism partly broken away to show the manner in which one of the ejector bellcrank levers and one of the locking levers is fulcrummed within the pattern cam removal device.
  • the pattern cam removal mechanism of this invention is shown generally at 15, affixed to the top of a stack of permanently mounted cams 17 in a recess 18 provided therein. These permanently mounted cams are in turn mounted on a driven camshaft 19.
  • the camshaft is mounted rotatably on the axle 21.
  • a pair of screws 23 hold the pattern cam removal mechanism to the camshaft and the stack of permanently mounted cams.
  • An alignment boss 25 may be formed on the stack of the permanently mounted cams and projects up through a cutout 26 in the cam removal mechanism, so that an exchange cam 27 can be readily synchronized onto the cam stack.
  • the exchangeable pattern cam 27 is a flat disc having a central aperture 29 so that it may be mounted onto the pattern cam removal mechanism and also having an offset aperture 31 so that the cam may be placed over the alignment boss and therefore be synchronized with the cam stack.
  • the device as set forth in this specification is the preferred embodiment.
  • the pattern cam removal device may be used with only one exchangeable pattern cam without the accompanying cam stack.
  • the cam stack provides the usual environment for the cam removal mechanism but not the only possible construction.
  • the pattern cam removal mechanism has a central hub 33 which has an axial bore 35 and also has a base flange 37.
  • a plunger 39 is mounted within the axial bore and is slidable therein.
  • a pattern cam ejector means including two diametrically disposed levers 41 (one not shown), is mounted into the central hub through a pair of cutouts 43.
  • a pattern cam retaining means including a pair of diametrically disposed levers 45 (one not shown), is mounted into the central hub through a pair of cutouts 47.
  • the plunger 39 is a headed shaft which is axially slidable within the bore of the central hub.
  • the shaft has two pairs of detents 49 and 60 spaced along its length, the detents of each pair being positioned diametrically opposite each other.
  • These detents are used in conjunc tion with a plunger retaining means which includes on each side of the central hub a ball 51, a spring 53 and a screw 55 all mounted within a horizontal bore 56. The spring forces the ball into the detents to retain the plunger in one of two preselected positions, either up or down.
  • the pattern cam ejector levers 41 take the form of bellcrank levers each having one leg 62 longer than the other leg 63 and being formed at the point where these legs meet with an angular bend. 64. Also, at angular bend there are tab ears 65 which are inserted into recesses 66 formed in the underside of the base flange. The levers are held in place and pivoted upon tab supports 67 integral with the plate 69 held to the underside of the base flange by means of a pair of screws 71 (one not shown).
  • the base flange has a notch 73 formed on its upper surface to accommodate flush within its surface the longer leg of the bellcrank lever when a cam is seated on the base flange.
  • the shorter leg of the bellcrank lever protrudes through the cutout 43 into the axial bore of the central hub and rests in the groove 61.
  • the following action is apparent from a study of FIGS. 3 and 4.
  • the longer leg of the bellcrank lies flush in the notch 73 so that the cam can rest directly on the base flange.
  • the shorter leg rests in the groove 61 and is contacted by the lower flange of the plunger shaft.
  • the plunger at this time is in the upward position and is securedthere by the plunger retaining means.
  • the plunger When it is desired to remove the exchange cam the plunger is depressed and the upper annular flange of the plunger shaft contacts the short arm of the bellcrank so as to cause the long lever arm to rise from the notch in the base flange whereby the cam is caused to rise from the base flange.
  • the two levers 45 which comprise the pattern cam retaining means are diametrically disposed partially within the eutouts 47 in the central hub.
  • the retaining levers 45 are substantially in the shape of an inverted L and tab cars 75 protrude at the pivot point.- These tab ears are inserted into recesses (not shown) formed in the underside of the base flange in a manner similar to that used for the ejector levers.
  • the levers are held in place and pivoted upon tab supports 77 integral with the plate 69 held to the underside of the base flange by means of screws 71 (one not shown).
  • the levers are partially positioned within the central hub so that when the plunger is in an up position and a cam is seated on the base flange, the levers are forece forced outwardly over the seated cam by contact with the upper annular flange 57 of the raised plunger shaft.
  • the cam is to be exchanged, the plunger is depressed and the annular flange 57 is shifted out of contact with the retaining lever 45 whichis then free to be urged inwardly by the rising cam because it lacks the support of the annular flan e as shown in FIG. 6.
  • needle vibrating mechanism including a releasably mounted pattern cam operatively connected to vibrate said needle, a camshaft for mounting said pattern cam; a pattern cam removal device mounted on said camshaft having a base flange and a central hub including a plunger axially shiftable in a bore formed lengthwise in said hub, said central hub being formed with first and second cutouts, pattern cam ejector means cooperatively associated with said plunger through said first cutouts in the central hub, and pattern cam retaining means associated with said plunger through said second cutouts in the central hub whereby when the plunger is in a depressed position the ejector means elevates a cam on the central hub and when the plunger is in an elevated position the retaining means restrains a cam on the central hub.
  • the ejector means comprises a pair of bellcrank levers diametrically disposed partially within the central hub, one arm of each bellcrank extending radially outwardly of the central hub selectively at an acute angle to the central hub when the plunger is depressed and at a substantially right angle to the central hub when the plunger is elevated, the other arm of each bellcrank lever extending through the cutout in the central hub into a groove formed in the plunger.
  • pattern cam removal device as recited in claim 1 wherein the pattern cam retaining means includes a pair of levers diametrically disposed within the central hub, part of each lever extending radially outwardly of the central hub to partially overlie the pattern cam when it is mounted on the central hub and the other part of each of the levers extending through the cutout in the central hub to abut a flange formed on the plunger.
  • pattern cam removal device as recited in claim 1 wherein the pattern cam ejector means includes a pair of bellcrank levers diametrically opposed to one another and wherein the pattern cam retaining means includes a pair of levers each disposed diametrically opposite one another and each disposed in between a pattern cam ejector lever.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US34036A 1970-05-04 1970-05-04 Cam removal unit Expired - Lifetime US3587491A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3403670A 1970-05-04 1970-05-04

Publications (1)

Publication Number Publication Date
US3587491A true US3587491A (en) 1971-06-28

Family

ID=21873908

Family Applications (1)

Application Number Title Priority Date Filing Date
US34036A Expired - Lifetime US3587491A (en) 1970-05-04 1970-05-04 Cam removal unit

Country Status (4)

Country Link
US (1) US3587491A (enExample)
BR (1) BR7102649D0 (enExample)
FR (1) FR2088301B1 (enExample)
GB (1) GB1314492A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628478A (en) * 1970-08-17 1971-12-21 Singer Co Mechanism for selectively retaining or removing an exchangeable pattern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628478A (en) * 1970-08-17 1971-12-21 Singer Co Mechanism for selectively retaining or removing an exchangeable pattern

Also Published As

Publication number Publication date
FR2088301B1 (enExample) 1973-06-08
FR2088301A1 (enExample) 1972-01-07
GB1314492A (en) 1973-04-26
BR7102649D0 (pt) 1973-04-19

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SSMC INC., A CORP. OF DE, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005041/0077

Effective date: 19881202