US3430592A - Blade mounting for impact cutters - Google Patents

Blade mounting for impact cutters Download PDF

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US3430592A
US3430592A US669149A US3430592DA US3430592A US 3430592 A US3430592 A US 3430592A US 669149 A US669149 A US 669149A US 3430592D A US3430592D A US 3430592DA US 3430592 A US3430592 A US 3430592A
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blade
cutter
recess
impact
block
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US669149A
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Richard A Florczak
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Singer Co
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Singer Co
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • 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

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  • the novel blade mounting for the impact cutter includes a block fixedly connected to the movable end of the cutter and a blade loosely connected to the block.
  • the improved mounting is designed to provide:
  • (1) means adjacent the blade connection to the block so as to permit limited blade deflection on operation of the cutter, or (2) a blade having an arcuate upper edge disposed in point contact with the block so as to permit the blade to pivot into alignment for full line cutting on operation of said impact cutter, or (3) a blade mounting including both of the features set forth above under items (1) and (2).
  • FIGIIRE l is a head end elevational view of part of a sewing machine embodying the present invention.
  • FIGURE 2 is a view taken along line 2--2 of FIG- URE 1.
  • FIGURE 3 is an exploded perspective view of the improved blade mounting.
  • FIGURE 4 is a two positional view of the self-aligning feature of the improved blade mounting.
  • FIGURE 1 The head end of a conventional sewing machine is shown in FIGURE 1 embodying the present invention.
  • a needle bar 10 is journaled for endwise reciprocatory movement in a needle bar bushing 12 mounted in the head 14 of the sewing machine.
  • the lower end of needle bar 10 has an eye pointed needle 16 connected thereto for reciprocation therewith to penetrate into the bed 18 as part of the usual stitch forming operation.
  • a presser bar bushing 20 is also mounted in the head and has a presser bar 22 journaled therein at the lower end of which is connected a presser foot 24 which coacts with a feed dog 26 disposed in the bed and actuated to rise above the flat working surface 28 in timed sequence to feed the material being sewn in the machine.
  • An impact cutter 30, which may be of the pneumatic type as illustrated in FIGURES 1 and 2, is mounted adjacent to the head 14.
  • the axis of the cutter 30* forms an angle of substantially with the flat working surface 28 to define a line of inclination designated generally as 32.
  • a conventional air cylinder 34 has a spring returned piston (not shown) therein connected to a non-rotatable endwise movable blade-carrying bar 36, the axis of which coincide with the axial line 32.
  • the upper end of air cylinder 34 has a tube 38 fixedly connected thereto so as to connect the air cylinder to a suitable source of pressure air (not shown).
  • the air cylinder 34 is of conventional design and operates when air is fed through the tube 38 to drive the piston and the connected blade-carrying bar 36 downwardly with suflicient force to effect cutting after which the spring will restore the bar 36 and piston to the inoperative or retracted position.
  • the air cylinder 34 of the impact cutter is mounted behind the presser bar 22 by a mounting bracket 40 that is held in assembled position by a clamp bar 42 which acts to secure the bracket 40 to the needle bar bushing 12 and the presser bar bushing 20, as illustrated in FIGURE 2.
  • a flange 44 is formed at the free end of bracket 40 and positioned to lie in a plane perpendicular to the inclined axis 32.
  • the flange 44 has a hole therein through which the blade-carrying rod 36 extends.
  • the fitting 'on the lower end of the air cylinder 34 is threaded to receive a nut 46 that is drawn up against a star washer 48 which in turn locks against the lower side of the flange 44 and secures the air cylinder 34 in assembled position, as shown in FIGURE 1.
  • the blade-carrying bar 36 is octagonally shaped and slides endwise in a correspondingly shaped opening (not shown) in the air cylinder 34 so as to be non-turnable relative to the longitudinal axis of the air cylinder.
  • the lower end of the bar 36 is threaded, as at portion 50, to receive a jam nut 52 prior to being threaded into a hole 54 of a block 56.
  • the jam nut 52 is turned down to lock the block 56 which is bifurcated to form a recess 58 which extends upwardly from the bottom thereof, in a plane perpendicular to the line of feed and the length of the feed dog 26.
  • the recess 58 has a substantially flat base 60 from which a front leg 62 and a rear leg 64 extends on either side thereof.
  • a blade 66 and a resilient member or pad 68, as illustrated in FIGURES 1 and 3, are disposed in the recess 58 and secured by a pair of screws 70 passing through holes in the front leg 62 and threaded into the rear leg 64.
  • the blade 66 and the resilient pad 68 preferably have a combined thickness that is substantially equal to the width of the recess 58.
  • the blade 66 is preferably placed adjacent the rear leg 64, and the pad 68 placed adjacent the front leg 62.
  • the blade 66 has generously sized clearance apertures 72 through which the mounting screws 70 pass, thereby permitting the blade 66 to have a limited degree of freedom of movement within the recess 58, the freedom of movement being somewhat retarded by the resilient member 68.
  • the lower edge of the blade 66 is formed with a knife edge 74, while the upper edge 76 is arcuately shaped.
  • the arcuate edge 76 abuts against the surface 60 of the recess 58 and the clearance apertures 72 permit the blade 66 to rock on the surface 60' and thereby be completely self-aligning, as is illustrated in FIGURE 4.
  • the dotted representation shows the arcuate edge 76 in point contact with the base 60 at a general point designated A.
  • the point A may represent any point of contact prior to the knife edge 74 contacting the flat working surface 28. -If the blade 66 were to retain such a position the cutting action of the blade 66 would be defective.
  • edge 74 Whenever the knife edge 74 does not make full line contact with the flat working surface 28 the initial contact of edge 74 will force the arcuate edge 76 to roll against the base 60 as the blade 66 continues to decend until a point of contact, designated generally B, is reached which represents the point at which the knife edge 74 comes into full line contact with the working surface 28.
  • the apertures 72 are so large that the blade 66 is permitted to shift instantaneously from point A to point B without interference from the screws 70.
  • the pad 68 also does not interfere with the self-alignment of the blade 66.
  • the present impact cutter 30 is activated to drive the knife edge 74, of the blade 66 against the fiat working surface 28 to sever any material or thread lying on the surface.
  • the force of the cutting action is usually much greater than that required for any particular item being out. In the past this has resulted in excessive wear of the blade and or the impact surface, requiring the frequent replacement of either or both.
  • the improved blade mounting of the present invention eliminates this problem and greatly extends the life of both the blade 66 and that portion of the working surface 28 upon which the blade comes into contact.
  • the blade 66 has been loosely mounted thereto with the additional space in the recess 58 taken up by the resilient member 68 which, when the compact cutter 30 is actuated, will act as a shock absorber.
  • the knife edge 74 of the blade 66 contacts the flat working surface 28 the striking force of the blade is great ly dissipated by the pad 68. Since the blade 66 lies along the inclined axis 32 the ability of the blade 66 to defleet against the resilient member 68 is greatly enhanced. The deflection of the blade 66 absorbs most of the excess striking force without interfering with the cutting action of the blade 66 or the self-aligning feature described hereinbefore.
  • the resilient member 68 may be made of any suitable material such as natural or synthetic rubber (such as neoprene), or other plastic.
  • the knife edge 74 of the blade 66 will strike the working surface 28 to cut the thread or material, guillotine fashion and as the blade 66 strikes the surface the resilient member 68 will permit blade deflection.
  • Any small mounting misalignments of either the air cylinder 34 or the blade 66 are provided for by having the rounded or arcuate edge 76 of the blade 66 rock on the base 60 of the recess to insure full line contact of the knife edge 74 on the working surface 28.
  • An improved cutter blade mounting for a sewing machine thread chain impact cutter having a movable carrier and means for imparting operative and retractive movements to said carrier, said improved cutter blade mounting comprising:
  • the recess has a substantially flat base
  • the edge of the blade adjacent the fiat base of the recess is formed arcuately to have a point contact with said base and adapted on operation of the cutter to shift into aligned position for full line cutting by said blade.
  • a blade mounting for a sewing machine impact cutter intermittently operated against a flat surface comprising:
  • (e) means loosely connecting the blade in the recess of the block whereby on operation of the cutter the striking of the blade against the flat surface Will cause shifting of the arcuate end thereof to permit full line contact of the knife edge of said blade against the fiat surface.

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

Description

March 4, 1969 R. A. FLORCZAK BLADE MOUNTING FOR IMPACT GUT'IERS Filed Sept. 20, 1967 INVENTOR. Richard A. F lorczak s 5 E n 1 W l4asa i l Ea;
United States Patent BLADE MOUNTING FOR IMPACT CUTTERS Richard A. Florczak, Belleville, N.J., assignor to The Singer Company, New York, N.Y., a corporation of New Jersey Filed Sept. 20, 1967, Ser. No. 669,149
US. Cl. 112252 Int. Cl. Db 65/00; B26b 7/00, 3/00 5 Claims ABSTRACT OF THE DISCLOSURE This disclosure relates to an impact cutter for sewing machines and particularly to an improved cutter blade mounting which permits self-aligning of the cutter edge of the cutter blade with its cooperating ledger surface and also provides a resilient connection between the cutter blade and its carrier.
Background of the invention Summary of the invention In accordance with the present invention the novel blade mounting for the impact cutter includes a block fixedly connected to the movable end of the cutter and a blade loosely connected to the block. The improved mounting is designed to provide:
(1) means adjacent the blade connection to the block so as to permit limited blade deflection on operation of the cutter, or (2) a blade having an arcuate upper edge disposed in point contact with the block so as to permit the blade to pivot into alignment for full line cutting on operation of said impact cutter, or (3) a blade mounting including both of the features set forth above under items (1) and (2).
It is therefore an object of the present invention to provide an improved blade mounting for an impact cutter which overcomes the prior art disadvantages; which is simple, economical and reliable; which is self-aligning; which absorbs part of the shock of the striking force of the blade and permits limited blade deflection on operation of the impact cutter; and which improves blade life and cutting eificiency.
Other objects and advantages will be apparent from the following description of one embodiment of the invention and the novel features will be particularly pointed out hereinafter in the claims.
Brief description of the drawings This invention is illustrated in the accompanying drawings in which:
FIGIIRE l is a head end elevational view of part of a sewing machine embodying the present invention.
FIGURE 2 is a view taken along line 2--2 of FIG- URE 1.
FIGURE 3 is an exploded perspective view of the improved blade mounting.
FIGURE 4 is a two positional view of the self-aligning feature of the improved blade mounting.
Description of the invention The head end of a conventional sewing machine is shown in FIGURE 1 embodying the present invention.
Patented Mar. 4, 1969 A needle bar 10 is journaled for endwise reciprocatory movement in a needle bar bushing 12 mounted in the head 14 of the sewing machine. The lower end of needle bar 10 has an eye pointed needle 16 connected thereto for reciprocation therewith to penetrate into the bed 18 as part of the usual stitch forming operation. A presser bar bushing 20 is also mounted in the head and has a presser bar 22 journaled therein at the lower end of which is connected a presser foot 24 which coacts with a feed dog 26 disposed in the bed and actuated to rise above the flat working surface 28 in timed sequence to feed the material being sewn in the machine.
An impact cutter 30, which may be of the pneumatic type as illustrated in FIGURES 1 and 2, is mounted adjacent to the head 14. The axis of the cutter 30* forms an angle of substantially with the flat working surface 28 to define a line of inclination designated generally as 32. A conventional air cylinder 34 has a spring returned piston (not shown) therein connected to a non-rotatable endwise movable blade-carrying bar 36, the axis of which coincide with the axial line 32. The upper end of air cylinder 34 has a tube 38 fixedly connected thereto so as to connect the air cylinder to a suitable source of pressure air (not shown). The air cylinder 34 is of conventional design and operates when air is fed through the tube 38 to drive the piston and the connected blade-carrying bar 36 downwardly with suflicient force to effect cutting after which the spring will restore the bar 36 and piston to the inoperative or retracted position.
The air cylinder 34 of the impact cutter is mounted behind the presser bar 22 by a mounting bracket 40 that is held in assembled position by a clamp bar 42 which acts to secure the bracket 40 to the needle bar bushing 12 and the presser bar bushing 20, as illustrated in FIGURE 2. A flange 44 is formed at the free end of bracket 40 and positioned to lie in a plane perpendicular to the inclined axis 32. The flange 44 has a hole therein through which the blade-carrying rod 36 extends. The fitting 'on the lower end of the air cylinder 34 is threaded to receive a nut 46 that is drawn up against a star washer 48 which in turn locks against the lower side of the flange 44 and secures the air cylinder 34 in assembled position, as shown in FIGURE 1.
The blade-carrying bar 36 is octagonally shaped and slides endwise in a correspondingly shaped opening (not shown) in the air cylinder 34 so as to be non-turnable relative to the longitudinal axis of the air cylinder. The lower end of the bar 36 is threaded, as at portion 50, to receive a jam nut 52 prior to being threaded into a hole 54 of a block 56. The jam nut 52 is turned down to lock the block 56 which is bifurcated to form a recess 58 which extends upwardly from the bottom thereof, in a plane perpendicular to the line of feed and the length of the feed dog 26. The recess 58 has a substantially flat base 60 from which a front leg 62 and a rear leg 64 extends on either side thereof. A blade 66 and a resilient member or pad 68, as illustrated in FIGURES 1 and 3, are disposed in the recess 58 and secured by a pair of screws 70 passing through holes in the front leg 62 and threaded into the rear leg 64.
The blade 66 and the resilient pad 68 preferably have a combined thickness that is substantially equal to the width of the recess 58. The blade 66 is preferably placed adjacent the rear leg 64, and the pad 68 placed adjacent the front leg 62. The blade 66 has generously sized clearance apertures 72 through which the mounting screws 70 pass, thereby permitting the blade 66 to have a limited degree of freedom of movement within the recess 58, the freedom of movement being somewhat retarded by the resilient member 68.
The lower edge of the blade 66 is formed with a knife edge 74, while the upper edge 76 is arcuately shaped. The arcuate edge 76 abuts against the surface 60 of the recess 58 and the clearance apertures 72 permit the blade 66 to rock on the surface 60' and thereby be completely self-aligning, as is illustrated in FIGURE 4. The dotted representation shows the arcuate edge 76 in point contact with the base 60 at a general point designated A. The point A may represent any point of contact prior to the knife edge 74 contacting the flat working surface 28. -If the blade 66 were to retain such a position the cutting action of the blade 66 would be defective. Whenever the knife edge 74 does not make full line contact with the flat working surface 28 the initial contact of edge 74 will force the arcuate edge 76 to roll against the base 60 as the blade 66 continues to decend until a point of contact, designated generally B, is reached which represents the point at which the knife edge 74 comes into full line contact with the working surface 28. The apertures 72 are so large that the blade 66 is permitted to shift instantaneously from point A to point B without interference from the screws 70. The pad 68 also does not interfere with the self-alignment of the blade 66.
As in operation of the conventional impact or guillotine cutter, the present impact cutter 30 is activated to drive the knife edge 74, of the blade 66 against the fiat working surface 28 to sever any material or thread lying on the surface. Depending on the source of pressure air the force of the cutting action is usually much greater than that required for any particular item being out. In the past this has resulted in excessive wear of the blade and or the impact surface, requiring the frequent replacement of either or both. The improved blade mounting of the present invention eliminates this problem and greatly extends the life of both the blade 66 and that portion of the working surface 28 upon which the blade comes into contact.
Instead of fixedly connecting the blade in the mounting block the blade 66 has been loosely mounted thereto with the additional space in the recess 58 taken up by the resilient member 68 which, when the compact cutter 30 is actuated, will act as a shock absorber. When the knife edge 74 of the blade 66 contacts the flat working surface 28 the striking force of the blade is great ly dissipated by the pad 68. Since the blade 66 lies along the inclined axis 32 the ability of the blade 66 to defleet against the resilient member 68 is greatly enhanced. The deflection of the blade 66 absorbs most of the excess striking force without interfering with the cutting action of the blade 66 or the self-aligning feature described hereinbefore.
The resilient member 68 may be made of any suitable material such as natural or synthetic rubber (such as neoprene), or other plastic.
In summary, on actuation of the impact cutter 30 the knife edge 74 of the blade 66 will strike the working surface 28 to cut the thread or material, guillotine fashion and as the blade 66 strikes the surface the resilient member 68 will permit blade deflection. Any small mounting misalignments of either the air cylinder 34 or the blade 66 are provided for by having the rounded or arcuate edge 76 of the blade 66 rock on the base 60 of the recess to insure full line contact of the knife edge 74 on the working surface 28.
It will be understood that various changes in the details, materials, arrangements of parts and operating conditions which have been herein described and illustrated in order to explain the nature of the invention may be made by those skilled in the art within the principle and scope of the invention as expressed in the claims.
Having thus set forth the nature of the invention, what is claimed herein is:
1. An improved cutter blade mounting for a sewing machine thread chain impact cutter having a movable carrier and means for imparting operative and retractive movements to said carrier, said improved cutter blade mounting comprising:
(a) a block fixedly connected to one end of said movable carrier,
(b) a recess formed in the block,
(c) a cutter blade disposed in the recess of said block,
and having at least one aperture therein,
(d) at least one aperture formed in the block aligned with the recess and of smaller cross sectional area than the aperture formed in the blade, and
(e) a means loosely connecting said cutter blade to said block by extending through the apertures thereof to permit said blade to move relatively to said block.
2. The combination claimed in claim 1 wherein:
(a) the recess has a substantially flat base,
(b) the edge of the blade adjacent the fiat base of the recess is formed arcuately to have a point contact with said base and adapted on operation of the cutter to shift into aligned position for full line cutting by said blade.
3. The combination claimed in claim 1 wherein the cutter has an inclined axis and the blade mounting comprises:
(a) the recess of the block extended parallel to the axis of the cutter,
(b) the blade disposed in the recess substantially parallel to the axis of the cutter, and
(c) a means limiting blade deflection disposed in the recess on oneside of the blade.
4. The combination claimed in claim 3 wherein:
(a) the means permitting blade deflection disposed in the recess on the top side of above the blade.
5. A blade mounting for a sewing machine impact cutter intermittently operated against a flat surface comprising:
(a) a block fixedly connected to the cutter for actuation thereby,
(b) a recess formed in the block and having a substantially fiat base,
(0) a blade disposed in the recess,
(d) one end of the blade having a knife edge extending outwardly of the block, and the other end of the blade arcuately shaped for point contact against the base of the recess,
(e) means loosely connecting the blade in the recess of the block whereby on operation of the cutter the striking of the blade against the flat surface Will cause shifting of the arcuate end thereof to permit full line contact of the knife edge of said blade against the fiat surface.
References Cited UNITED STATES PATENTS 42,397 4/1864 Peters et al 30-169 876,789 1/ 1908 Erdmann 30-169 1,123,721 1/1915 Foster 112-252 2,747,533 5/1956 Enos 112-252 3,250,237 5/1966 Myska 112-252 3,303,805 2/1967 Steiner 112-252 HERBERT F. ROSS, Primary Examiner.
US. (:1. X.R. 30169, 275
US669149A 1967-09-20 1967-09-20 Blade mounting for impact cutters Expired - Lifetime US3430592A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696770A (en) * 1969-07-24 1972-10-10 Zalking Sewing Machine & Suppl Thread cutting attachment for a sewing machine
US3986467A (en) * 1975-04-08 1976-10-19 Angelica Corporation Guiding stitching and delivering system
US4453481A (en) * 1981-07-16 1984-06-12 Starkville Tool And Die Company Method and apparatus for cutting and tacking stitches
US6286445B1 (en) * 1999-09-24 2001-09-11 Clinton Industries, Inc. Unitary double-acting piston thread cutter assembly
US10357776B2 (en) * 2016-09-09 2019-07-23 Comcorp, Inc. Impact cutter blade and holder system and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US42397A (en) * 1864-04-19 Improved whitening-slicker for curriers
US876789A (en) * 1907-08-28 1908-01-14 William Erdmann Scraper.
US1123721A (en) * 1903-01-26 1915-01-05 Union Special Machine Co Thread-cutter for sewing-machines.
US2747533A (en) * 1951-10-29 1956-05-29 Singer Mfg Co Thread-severing devices for sewing machines
US3250237A (en) * 1963-02-27 1966-05-10 Duerkoppwerke Valve system for controlling a pressure fluid to a thread cutter combined with a sewing machine
US3303805A (en) * 1964-12-07 1967-02-14 Singer Co Thread cutters for sewing machines

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US42397A (en) * 1864-04-19 Improved whitening-slicker for curriers
US1123721A (en) * 1903-01-26 1915-01-05 Union Special Machine Co Thread-cutter for sewing-machines.
US876789A (en) * 1907-08-28 1908-01-14 William Erdmann Scraper.
US2747533A (en) * 1951-10-29 1956-05-29 Singer Mfg Co Thread-severing devices for sewing machines
US3250237A (en) * 1963-02-27 1966-05-10 Duerkoppwerke Valve system for controlling a pressure fluid to a thread cutter combined with a sewing machine
US3303805A (en) * 1964-12-07 1967-02-14 Singer Co Thread cutters for sewing machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3696770A (en) * 1969-07-24 1972-10-10 Zalking Sewing Machine & Suppl Thread cutting attachment for a sewing machine
US3986467A (en) * 1975-04-08 1976-10-19 Angelica Corporation Guiding stitching and delivering system
US4453481A (en) * 1981-07-16 1984-06-12 Starkville Tool And Die Company Method and apparatus for cutting and tacking stitches
US6286445B1 (en) * 1999-09-24 2001-09-11 Clinton Industries, Inc. Unitary double-acting piston thread cutter assembly
US10357776B2 (en) * 2016-09-09 2019-07-23 Comcorp, Inc. Impact cutter blade and holder system and method
US11084043B2 (en) * 2016-09-09 2021-08-10 Comcorp, Inc. Impact cutter blade and holder system and method

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