US3848554A - Cutting device for sewing machines - Google Patents

Cutting device for sewing machines Download PDF

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Publication number
US3848554A
US3848554A US00386546A US38654673A US3848554A US 3848554 A US3848554 A US 3848554A US 00386546 A US00386546 A US 00386546A US 38654673 A US38654673 A US 38654673A US 3848554 A US3848554 A US 3848554A
Authority
US
United States
Prior art keywords
knife
cutting
cylinder
carrier
cutting device
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
US00386546A
Other languages
English (en)
Inventor
M Kropf
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.)
Triumph International AG
Original Assignee
Triumph International AG
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 Triumph International AG filed Critical Triumph International AG
Application granted granted Critical
Publication of US3848554A publication Critical patent/US3848554A/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
    • D05B37/00—Devices incorporated in sewing machines for slitting, grooving, or cutting
    • D05B37/04—Cutting devices
    • D05B37/06—Cutting devices with oscillating tools
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/06—Work-feeding or -handling elements not otherwise provided for for attaching bands, ribbons, strips, or tapes or for binding
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B29/00—Pressers; Presser feet
    • D05B29/06—Presser feet
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2305/00—Operations on the work before or after sewing
    • D05D2305/08—Cutting the workpiece
    • D05D2305/12—Cutting the workpiece transversally

Definitions

  • the knife co-operates with a stationary anvil to achieve a cutting strike perpendicular to the surface 8 112,124 1 12/ i d of the sewn material and has drive means for the actu- 58] HFie'ld 130 125 ating of the cutting device.
  • At least one of the bearing a means which assures the cutting strike of the knife is angularly settable and adjustably by a setting means in [56] References Cited a plane perpendicular to the movement of the cutting st k UNITED STATES PATENTS m e 259,840 6/1882 Fowler 112/129 7 Clams 1 Draw'ng F'gure CUTTING DEVICE FOR SEWING MACHINES BACKGROUND OF THE INVENTION
  • the invention relates to a cutting device on sewing machines, particularly for the cutting of tapes, lace, or the like after they have been sewn to a piece of fabric.
  • the cutting line on the tape-like work must, in conformity with the shape of the edge of the carrier work, run obliquely to the edge of the tape or lace. In such instances, it is necessary to change in each given case the size of the cutting line angle in conformity with the longitudinal direction of the tape. While it does not present any problem to adjust the known cutting devices in such a way that the cutting line constitute a certain angle with respect to the feed line, it would be necessary to use with such cutting devices a separate device for each angle size, or else to convert or change the setting of the tape cutting device within the machine through cumbersome measures. In practice, therefore, in the event of an oblique cutting edge, the use of a tape-cutting device attached to the sewing machine was dispensed with and the tape manually cut by the operator.
  • the invention is based on the engineering objective of enabling the blade holder of a cutting device affixed to a sewing machine to perform, in addition to its customary cutting stroke movement substantially perpendicular to the sewing machine guide plate, another adjustable angular movement in a plane perpendicular to the movement of the cutting stroke where both degrees of freedom of movement are independent of one another.
  • the invention is based on a known tape-cutting device (U.S. Pat. No. 2,681,019) where the cutting blade strikes a stationary anvil.
  • a known tape-cutting device U.S. Pat. No. 2,681,019
  • this design offers the advantage that the angular displacement of the cutting knife has to be performed for one knife only.
  • the bearing means provided with the cutting blade and assuring the strike of the knife are angularly settable and adjustable by a special manual setting means in a plane perpendicular to the cutting stroke motion.
  • a special manual setting means in a plane perpendicular to the cutting stroke motion.
  • one of the two bearing means is settable and adjustable in the aforementioned manner, provided its co-operation with the other bearing means is independent of the angular, oblique position.
  • the oblique position of the cut can be adjusted at any time in any way desired through a change in setting of the special manual setting means.
  • this special setting means can be manually adjusted by the operator as required. It is, however, also readily possible to adjust the special manual setting means automatically by means of a scanning device effective on the sewing material to conform to the respective shape of the edge of the item to be sewn.
  • the device in accordance with the invention is arranged in such a way on the sewing machine that the axis around which the angular adjustment is brought about is arranged parallel to the axis of the presser-foot bar and is situated in the direction of feed. It is even preferred that the means for the angular swing and for the cutting stroke movement of the knife are arranged coaxially to the presser-foot bar.
  • This design permits the comparatively simple subsequent installation of the device in accordance with the invention in an existing sewing machine in view of the fact that it is generally adequate if the bearing bushing of the presser-foot bar in the lower wall of the sewing machine head is removed and the device in accordance with the invention is substituted therefor.
  • the drive to achieve the strike of the knife can be brought about in any known manner. Just as it is conceivable to operate it manually, it can also be actuated by means of compressed air, a hydraulic system, or a solenoid through the actuating of a corresponding release switch.
  • the cutting strike is pneumatically actuated in accordance with the preferred embodiment.
  • the knife carrier in its upper portion as a cylinder whose outer jacket is provided with an external gear for the drive of its angular setting movement and whose internal wall co-operates with a stationary carrier bushing arranged coaxially to the presser-foot bar to form a compressed-air operated slide system.
  • a particularly advantageous design of the knife carrier as a compressed-air actuated slide having a ring-shaped effective piston surface.
  • a cutting device for cutting sewn tapes, laces and the like and adaptable for use on a sewing machine includes a knife means arranged behind a presser foot with respect to the direction of feed of the material being sewn.
  • the knife means cooperates with a stationary anvil and is operable to effect a cutting and striking motion of the knife means substantially perpendicular to the surface of the material being sewn.
  • Drive means are provided for actuating the knife means to effectuate the cutting and striking motion of the knife means.
  • the knife means is rotatable about a bearing means which has an axis substantially perpendicular to the surface of the material being sewn, and adjustable means are provided for adjusting the angular position of the knife means about the axis of the bearing means.
  • the drawing schematically shows in an elevational view and partially in cross-section, a head of a sewing machine provided with a cutting device according to one embodiment of the invention.
  • a knife 5 arranged with respect to the direction of feed behind a needle bar 8 guiding a needle 9 and behind a presser foot 26 extends in the representation of the drawing with its blade perpendicular to the plane of the drawing and perpendicular to the direction of feed 29.
  • the blade of the knife 5 co-operates with an anvil 7 which is arranged inside or on a guide plate 27 and whose material is softer than the material of the cutting blade.
  • the strike or cutting motion of the knife is performed counter to the biasing effect of a return spring 28 arranged perpendicular to the guide plate 27, that is, preferably by means of a pneumatic knife driving device which is supplied or fed by the line 25.
  • a return spring 28 arranged perpendicular to the guide plate 27, that is, preferably by means of a pneumatic knife driving device which is supplied or fed by the line 25.
  • an actuating lever 13 which can be pivoted around the axis 6 at a substantially equidistant spacing from the guide plate 27.
  • a bearing shaft 11 arranged in the sewing machine head 10 substantially perpendicular to the guide plate 27 as close as possible to the presser-foot bar.
  • the bearing shaft 11 is constituted by the presser-foot bar itself, which, even though it is not of compelling necessity from the functional viewpoint, nevertheless affords the great advantage of reduced space requirement and the subsequent installment possibilities in existing sewing machines. If one uses the presser-foot bar as a bearing shaft for the cutting device, it is as a rule adequate to remove on a standard sewing machine the bushing constituting the presser foot bar bearing and to adapt the bottom wall of the sewing machine head for accommodating the cutting device through the arranging of corresponding recesses.
  • a carrier sleeve 17 is arranged on the bearing shaft 11 whose upper end is sealed off with respect to the housing of the machine head 10 and whose central portion 18 is provided with a large outside diameter whereas its lower portion 19 is provided with a small outside diameter.
  • the carrier sleeve 17 is subdivided into three sections of different diameter size.
  • the central portion of the carrier sleeve 18 is provided with a longitudinal borehole 24a extending parallel to the bearing shaft 11 and cooperating with a duct 24b of the sewing machine head 10 as an air supply means.
  • the knife carrier generally referred to by the numeral 1 consists, in accordance with the invention, of an upper part 2 and a lower part 3.
  • the knife carrier upper part 2 is designed as a hollow cylinder and is provided at the outer surface of its jacket with an external gear 4.
  • the upper part of the knife carrier 2 is designed with varying or different diameters so that the wall 20 at the upper end of the upper part 2 of the knife carrier corresponds to the outside diameter of the central portion 18 of the carrier sleeve whereas, in the lower area of the upper part 2 of the knife carrier, a segment-like lip 21 is fitted or provided on the outside diameter of the lower portion 19 of the carrier sleeve.
  • seals 22 and 23 are arranged between the wall 20 of the upper part of the knife carrier 2 and the carrier sleeve 17 on the one hand, as well as between the lip 21 of the upper portion 2 of the knife carrier and the carrier sleeve 17, on the other.
  • the type of construction described above makes it possible to' have the knife carrier I perform with respect to the carrier sleeve 17, which is mounted in stationary condition in the sewing machine, a rotary movement around the axis 6 as well as a longitudinal movement in the direction of the axis 6.
  • Air pressure built up via the pressure line 25 exerts downward pressure on the knife carrier 1 in any angular relative position of the knife carrier 1, with the air pressure on the knife carrier being effective on an annular surface whose diameters substantially correspond to the inside diameters of the wall 20 and the lip 21 of the upper portion 2 of the knife carrier.
  • the outside gear 4 of the upper part 2 of the knife carrier mates in accordance with the invention with an internal gear 15 of an actuating pawl 16 forming the shorter leg of the U-shaped lever 13 for the setting of the oblique position of U-shaped lever 13.
  • the longer leg of U-shaped lever 13 carries a bearing 14 which is pivotally carried on the bearing shaft 11.
  • the cutting knife 5 is provided with a stirrup-like shape with the two links extending vertically to the blade serving for the attaching of the knife 5 to the lower part 3 of the knife carrier by means of two screws 12.
  • the lower part 3 of the knife carrier is undercut with respect of the upper part 2 of the knife carrier preferably up to the elevation of the axis of the cutting knife movement so that the blade of the cutting knife 5 extends diametrically to such axis.
  • the device in accordance with the invention permits the sewing machine operator manually to adjust from case to case the angle of the cut to be performed as required to any desired size and to actuate the knife strike, following setting of the oblique position.
  • the knife strike be actuated pneumatically or hydraulically.
  • a cutting device for cutting sewn tapes, laces, and the like and adapted for use on a sewing machine of the type having a presser foot and a stationary anvil comprising a knife means arranged behind said presser foot with respect to the direction of feed of the material being sewn, said knife means cooperating with said stationary anvil and being operable to provide a striking and cutting motion of said knife means substantially perpendicular to the surface of the material being sewn, drive means for actuating said knife means to effectuate said striking and cutting motion of said knife means, bearing means about which said knife means is rotatable, said bearing means having an axis substantially perpendicular to the surface of the material being sewn, adjustable means for adjusting the angular position of said knife means about said axis, said presser foot having a support bar, said axis of said bearing means being disposed parallel to said support bar, said axis of said bearing means and support bar being generally aligned in the direction of feed of said sewn material, said knife means including a
  • a cutting device as set forth in claim 2 including seal means disposed between the upper portion of said carrier sleeve and said internal wall of said cylinder, and seal means disposed at said lower portion of said carrier sleeve and adjacent to said segment-like lip.
  • a cutting device as set forth in claim 1 wherein said knife carrier has an upper portion extending laterally beyond an undercut part of a lower portion of said knife carrier, said knife blade being mounted on said knife carrier such that said knife blade is arranged diametrically relative to the axis of said cylinder.
  • said adjustable means further including an actuating lever pivotal about said bearing means, said actuating lever including an actuating pawl, an internal gear mounted on said actuating pawl and operable to engage said external gear on said cylinder of said knife means, whereby pivotal movement of said actuating lever adjusts the angular position of said knife means.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00386546A 1972-08-09 1973-08-08 Cutting device for sewing machines Expired - Lifetime US3848554A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2239148A DE2239148C3 (de) 1972-08-09 1972-08-09 Nähmaschine mit Bandabschneidevorrichtung

Publications (1)

Publication Number Publication Date
US3848554A true US3848554A (en) 1974-11-19

Family

ID=5853111

Family Applications (1)

Application Number Title Priority Date Filing Date
US00386546A Expired - Lifetime US3848554A (en) 1972-08-09 1973-08-08 Cutting device for sewing machines

Country Status (9)

Country Link
US (1) US3848554A (cs)
JP (1) JPS4963546A (cs)
CS (1) CS175460B2 (cs)
DD (1) DD107319A5 (cs)
DE (1) DE2239148C3 (cs)
ES (1) ES417689A1 (cs)
FR (1) FR2195981A5 (cs)
GB (1) GB1435594A (cs)
IT (1) IT994563B (cs)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075954A (en) * 1975-12-11 1978-02-28 Pfaff Industriemaschinen Gmbh Device for making braid openings in cuts of garments
US4335666A (en) * 1979-09-01 1982-06-22 Union Special G.M.B.H. Strip severing mechanism for sewing machines
US5274427A (en) * 1991-03-28 1993-12-28 Dainippon Screen Mfg. Co., Ltd. Scanning exposure apparatus having cutting structure for severing photosensitive web
CH699452A1 (de) * 2008-09-04 2010-03-15 Bernina Int Ag Vorrichtung zum Ausschneiden von textilen und nicht-textilen Flächengebilden mit einer Nähmaschine.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US259840A (en) * 1882-06-20 William e
CH27790A (de) * 1903-11-19 1904-06-15 Jean Kaufmann Zierstichmaschine mit Aussneidvorrichtung
US1116701A (en) * 1904-04-07 1914-11-10 Union Special Machine Co Sewing and trimming machine.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US259840A (en) * 1882-06-20 William e
CH27790A (de) * 1903-11-19 1904-06-15 Jean Kaufmann Zierstichmaschine mit Aussneidvorrichtung
US1116701A (en) * 1904-04-07 1914-11-10 Union Special Machine Co Sewing and trimming machine.

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075954A (en) * 1975-12-11 1978-02-28 Pfaff Industriemaschinen Gmbh Device for making braid openings in cuts of garments
US4335666A (en) * 1979-09-01 1982-06-22 Union Special G.M.B.H. Strip severing mechanism for sewing machines
US5274427A (en) * 1991-03-28 1993-12-28 Dainippon Screen Mfg. Co., Ltd. Scanning exposure apparatus having cutting structure for severing photosensitive web
CH699452A1 (de) * 2008-09-04 2010-03-15 Bernina Int Ag Vorrichtung zum Ausschneiden von textilen und nicht-textilen Flächengebilden mit einer Nähmaschine.

Also Published As

Publication number Publication date
DD107319A5 (cs) 1974-07-20
IT994563B (it) 1975-10-20
JPS4963546A (cs) 1974-06-20
CS175460B2 (cs) 1977-05-31
DE2239148B2 (de) 1974-09-19
GB1435594A (en) 1976-05-12
FR2195981A5 (cs) 1974-03-08
DE2239148A1 (de) 1974-02-21
DE2239148C3 (de) 1975-04-24
ES417689A1 (es) 1976-02-16

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