US3628478A - Mechanism for selectively retaining or removing an exchangeable pattern - Google Patents

Mechanism for selectively retaining or removing an exchangeable pattern Download PDF

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Publication number
US3628478A
US3628478A US64546A US3628478DA US3628478A US 3628478 A US3628478 A US 3628478A US 64546 A US64546 A US 64546A US 3628478D A US3628478D A US 3628478DA US 3628478 A US3628478 A US 3628478A
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US
United States
Prior art keywords
cam
base portion
pattern
pattern cam
plunger
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
US64546A
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English (en)
Inventor
John C Seck
Howard D Rogers
Thomas G Graham
James H Hannen Jr
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
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Filing date
Publication date
Application filed by Singer Co filed Critical Singer Co
Application granted granted Critical
Publication of US3628478A publication Critical patent/US3628478A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Definitions

  • Robert E. Smith ABSTRACT A pattern cam removal device for removing a seated pattern cam upwardly from the interior of a sewing machine to an accessible position.
  • a plunger is slidable axially relatively to the cam shaft and at the lower end of the plunger there is attached a pronged elevator member. When the plunger is raised, the pronged elevator member raises a pattern cam to a position where it is accessible for exchange.
  • a pair of resilient-retaining fingers hold the pattern cam in place on the base portion of the device.
  • a sewing machine is usually provided with a small access opening in the top horizontal portion of the sewing machine. At maximum, three fingers may be inserted into this access opening and thus grasping the cam, which must be tightly seated on the cam shaft, can be an awkward chore.
  • Another problem encountered in attempting to remove a pattern cam from the sewing machine is that the operator of a sewing machine is often a woman with long manicured fingernails and frequently when the woman inserts her fingers in the access opening, the result is a broken fingernail.
  • the interior portion of a sewing machine is usually well oiled and when the operator must insert her fingers inside the sewing machine they may pick up oil and this may lead to the fabric workpiece becoming soiled.
  • cam Another problem with the usual pattern cam is that it must have a handle extension rising up from the flat cam surface so that the operator can remove the cam and this results in the cam being approximately three times larger in height than it really need be. This construction requirement adds to the storage space requirement.
  • the device itself is mounted on the upper portion of a cam shaft within the sewing machine casing and it enables the sewing machine operator to obtain access to a pattern cam by merely lifting a plunger which is constrained axially in the sewing machine casing.
  • the device secured to the cam shaft, has a slotted base portion and a central hub both of which have an axial bore. The plunger slides in the axial bore and a three pronged elevator is attached at the lower extremity of the plunger.
  • the plunger When the plunger is raised it causes the three pronged elevator to rise through the slotted base portion and thereby raise a seated cam to a position where it will be easily accessible to the sewing machine operator.
  • a pair of bowed retaining fingers hold a seated pattern cam to the base once the operator has placed the cam on the device.
  • the pattern cam removal device is semiautomatic in that it is not spring loaded, for the purpose of automatically ejecting a cam, and so the elevation of the pattern cam is directly controlled by the operator and the construction of the device remains simple.
  • Another object of this invention is to save storage space by eliminating the necessity for providing an extension on the pattern cam to enable the operator to grasp the cam from the sewing machine.
  • FIG. 1 is an exploded perspective of the pattern cam sup port device without a pattern cam.
  • FIG. 2 is a top plan view of the assembled pattern cam support device without a pattern cam.
  • FIG. 3 is an elevation view of the pattern cam support device taken substantially along the section line 33 of FIG. 2, showing a pattern cam mounted thereon in operative position.
  • FIG. 4 is an elevation view similar to that of FIG. 3, showing a pattern cam in a raised position for exchange.
  • a pattern cam removal device 11 is mounted upon a rotating cam shaft 13 within a sewing machine casing (not shown).
  • An exchangeable pattern cam 15 may be removably mounted on top of the pattern cam removal device as shown in FIGS. 3 and 4.
  • the pattern cam removal device comprises a base portion 17 and a central hub 19.
  • the upper surface 21 of the base portion provides a cam seat for the exchangeable pattern cam.
  • the base portion itself may have permanent cam formations on its outer circumference if so desired.
  • the base portion is formed with a pair of arcuate recesses 23 and three spaced slots 25, the purpose of these formations being later explained.
  • An axial bore 27 has been formed both through the central hub and the base portion.
  • the central hub has a pair of vertical notches 29 cut into opposite sides of its circumference and these notches continue the full height of the central hub and partially below the upper surface of the base portion. These notches also extend outwardly to the arcuate recesses 23.
  • a key 31 is formed onto the central hub from the upper extremity of the central hub to the base portion upper surface 21. This key provides a guide when inserting a cam onto the central hub and also prevents relative rotation between the cam and the pattern cam removal device.
  • a seated cam is held onto the base portion upper surface or cam seat by a pair of L" shaped vertically mounted resilientretaining fingers 35, each having an arcuate base 37 and an upright portion 38.
  • the arcuately shaped base allows the retaining fingers to be supportably sli ped into the arcuate recesses 23 of the base portion of the pattern cam removal device.
  • An elongated aperture 39 is formed in each base of the retaining fingers.
  • the retaining fingers are held to the pattern cam removal device by means of a pair of screws 41'one of which passes through the aperture in the base of each of the retaining fingers and also passes through each of a pair of holes 43 in the arcuate recesses 23 of the base portion of the pattern cam removal device and are secured into the cam shaft in threaded holes 45.
  • the resilient fingers 35 are each formed so that the upright portion 38 is normally spaced apart from the central hub. However, when a cam is being mounted on the cam shaft the upright portions of these fingers are pushed into the notches 29 in the central hub and because of a particular bowed shape of these fingers they are held there by the cam until the cam is fully seated. Then the fingers are permitted by their bowed shape to partially overlie the top surface of the seated cam thereby holding the cam to the cam seat.
  • a plunger 53 is slidably mounted within the axial bore 27.
  • the plunger has a head portion 55, a shaft portion 57, and a reduced extremity 58. When the plunger is in a completely down position it extends below the underside of the base portion of the pattern cam removal device.
  • a pattern cam elevator 59 consists of a washerlike base portion 61 having a central aperture 63 in which the reduced extremity of the plunger shaft is brazed. Three spaced prongs 65 are formed integrally with the washerlike base and extend upwardly therefrom. Fully assembled, the prongs of the pattern cam elevator are in register with and slidably within the slots 25 which are formed in the base portion 17 of the pattern cam removal device. The pattern cam elevator may travel within the hollowed out portion 67 beneath the underside of the pattern cam removal device. When the plunger is raised upwardly, the prongs of the pattern cam elevator will not ride out of the slots because the washerlike base will abut the underside of the base portion 17 of the pattern cam removal device. When the plunger is fully depressed the prongs will not ride out of the slots because the head of the plunger will abut the central hub.
  • the operation of the device is as simple as its construction.
  • the cam need only be aligned with the key portion of the central hub and pressed down on the central hub until the retaining fingers overlie the top of the cam.
  • the plunger is pulled up against the force of the resilient-retaining fingers until the cam pushes the resilient fingers into the notches formed in the central hub and passes over the fingers. Thereafter the cam will be in an easily accessible raised position for removal by hand.
  • a pattern cam removal device adapted for removing a mounted pattern cam comprising:
  • At least one resilient-retaining finger for retaining a pattern cam on the base portion
  • said base portion having a plurality of slots formed therethrough;
  • said cam elevator operatively connected to the plunger beneath the base portion, the cam elevator having vertical prongs in registration with the plurality of slots through the base portion, whereby as the plunger is raised the vertical prongs are moved upwardly through the plurality of slots to contact the pattern cam mounted on the base portion and raise it upwardly.
  • cam elevator has a washerlike base portion having a central aperture and three prongs extending vertically therefrom, said cam elevator being secured to the lower portion of the plunger.
  • the pattern cam removal device as recited in claim 1 further comprising:
  • the base portion having a pair of diametrically disposed recesses for mounting the resilient-retaining fingers
  • the central hub having a pair of diametrically disposed vertical notches aligned with the recesses in the base portion for accepting the retaining fingers flush with the central hub when a pattern cam is being mounted on or removed from the central hub.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US64546A 1970-08-17 1970-08-17 Mechanism for selectively retaining or removing an exchangeable pattern Expired - Lifetime US3628478A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6454670A 1970-08-17 1970-08-17

Publications (1)

Publication Number Publication Date
US3628478A true US3628478A (en) 1971-12-21

Family

ID=22056720

Family Applications (1)

Application Number Title Priority Date Filing Date
US64546A Expired - Lifetime US3628478A (en) 1970-08-17 1970-08-17 Mechanism for selectively retaining or removing an exchangeable pattern

Country Status (4)

Country Link
US (1) US3628478A (enExample)
JP (1) JPS5337780Y2 (enExample)
BR (1) BR7104892D0 (enExample)
GB (1) GB1354150A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178927A (en) * 1975-11-03 1979-12-18 Valleylab Intravenous liquid delivery system
EP0167035A1 (en) * 1984-06-12 1986-01-08 Stabilimento Industriale Singer Srl Locking device for removable sewing-machine control cams

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879732A (en) * 1954-11-03 1959-03-31 Mefina Sa Device for the automatic fixing of control cams on their shaft in a zig-zag stitch sewing machine
US3457887A (en) * 1967-02-07 1969-07-29 Singer Co Cam removing device for a sewing machine
US3587491A (en) * 1970-05-04 1971-06-28 Singer Co Cam removal unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2879732A (en) * 1954-11-03 1959-03-31 Mefina Sa Device for the automatic fixing of control cams on their shaft in a zig-zag stitch sewing machine
US3457887A (en) * 1967-02-07 1969-07-29 Singer Co Cam removing device for a sewing machine
US3587491A (en) * 1970-05-04 1971-06-28 Singer Co Cam removal unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4178927A (en) * 1975-11-03 1979-12-18 Valleylab Intravenous liquid delivery system
EP0167035A1 (en) * 1984-06-12 1986-01-08 Stabilimento Industriale Singer Srl Locking device for removable sewing-machine control cams

Also Published As

Publication number Publication date
JPS5337780Y2 (enExample) 1978-09-13
BR7104892D0 (pt) 1973-04-19
JPS47147U (enExample) 1972-03-24
GB1354150A (en) 1974-06-05

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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