US3648634A - Thread-cutting device for sewing machines - Google Patents

Thread-cutting device for sewing machines Download PDF

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Publication number
US3648634A
US3648634A US32032A US3648634DA US3648634A US 3648634 A US3648634 A US 3648634A US 32032 A US32032 A US 32032A US 3648634D A US3648634D A US 3648634DA US 3648634 A US3648634 A US 3648634A
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US
United States
Prior art keywords
cylinder block
plate
slide plate
cutting knife
thread
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
US32032A
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English (en)
Inventor
Johannus Franciscus Hazendonk
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.)
Dejong and Devlieger Machinehandel NV
Original Assignee
Dejong and Devlieger Machinehandel NV
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Filing date
Publication date
Application filed by Dejong and Devlieger Machinehandel NV filed Critical Dejong and Devlieger Machinehandel NV
Application granted granted Critical
Publication of US3648634A publication Critical patent/US3648634A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • ABSTRACT A thread-cutting device for sewing machines of the kind hav- [30] Foreign Application Priority Data ing a machine base plate with a side opening therein which ac- Nov 13 1969 Netherlands 6917054 commodates the cloth plate of the machine and a removable slide plate allowing access to the space underneath the 52 us. 121 112/252 machine base Plate which Ming is mined [51] IHLCL 65/00 be mounted against the lower side of the slide plate.
  • the [58] Field of Search ..112/252 thread-flitting device has a Compact Structure Of a desig" lowing the device to be mounted on the slide plates of different types of sewing machines.
  • the invention relates to a thread-cutting device for sewing machines and more in particular to such a device for sewing machines of the conventional kind having a machine base plate with a side opening therein which accommodates a cloth plate and a removable slide plate adjacent the cloth plate allowing access to the space underneath the cloth plate and base plate in which the stitch forming means, such as the bobbin and rotary hook mechanism, are arranged.
  • the manufacturer or supplier of the thread-cutting device who has to perform this task is thus forced to keep in stock a great number of thread-cutting devices of different design and configuration adapted to the several types of sewing machines on the market while also the manner of mounting the thread-cutting device is different for each sewing machine type. Thereby the manufacturing and mounting costs of the thread-cutting device are considerably increased.
  • the invention has for its main object to obviate these disadvantages and to make it possible to use identical threadcutting devices for different types of sewing machines of the above-described kind which devices can be mounted in A machines in a uniform manner.
  • Another object of the invention is to provide such a threadcutting device which has a simple and compact design and can be easily and quickly mounted in the sewing machine concerned in the correct position with respect to the stitch forming means thereof.
  • the thread-cutting device is mounted against the lower side of the slide plate of the sewing machine adjacent the stitch forming means in a position for cutting the threads closely below the cloth plate.
  • the thread-cutting device may be of the type having a pneumatically driven cylinder and piston arrangement in which the piston is coupled to a flat hook-shaped cutting knife arranged for movement in a plane parallel to and closely below the cloth plate, which cutting knife on its actuation catches the sewing threads and pulls the latter towards a stationary cutting knife for the cutting of the threads.
  • the cylinder is mounted against the lower face of the machine base plate to one side of the slide plate in which the outwardly projecting piston rod of the piston through a coupling mechanism drives the movable cutting knife with a swinging movement.
  • the cutting device of the invention comprises a cylinder block having a bore and adapted to be mounted against the lower side of the slide plate with the axis of the bore extending substantially normal to the front edge of the slide plate adjacent the cloth plate.
  • a piston is arranged in the bore adapted to be pneumatically driven for reciprocating movement in this bore and is secured to a piston rod extending rearwardly from the piston in a direction away from said slide plate forward edge.
  • the cylinder block has a recessed guide way formed in its upper face and extending parallel to the cylinder bore axis and a movable cutting knife having a hook-shaped forward end and a flat straight body portion is arranged for reciprocating sliding movement in this guide way in a position in which the knife forward end is directed towards the cloth plate.
  • the body portion has its rear end secured to the rearwardly extending end of the piston rod to be driven thereby.
  • a cover plate is secured against the upper face of the cylinder block for confining the movable cutting knife body portion in the recessed guide way which cover plate has an extension at its forward edge adjacent the cloth plate formed into a stationary cutting knife disposed above the movable cutting knife for cooperation therewith.
  • the movable cutting knife is disposed for linear reciprocating movement immediately above the cylinder and the piston rod to which it is coupled whereby the cutting device forms a compact structure of relatively small axial length and may be easily disposed in the space available below the slide plate.
  • the guide way in the cylinder block has adjacent the forward edge of the slide plate a recess for accomodating a leaf spring which presses the movable cutting knife against the stationary knife in order to ensure a proper cutting action.
  • the slide plate carries at its lower side a laterally projecting leaf spring which engages the edge portions of the base plate side opening in order to hold the slide plate in its closed position with a light clamping action. If, however, the slide plate carries the thread-cutting device as the invention suggests, this clamping action is generally insufficient to hold the slide plate in position against the forces acting thereon during the operation of the cutting device.
  • the slide plate may be provided at both its sides with laterally projecting clamping members adapted to engage the underside of the machine base plate and carrying clamping screws for firmly securing the slide plate in the base plate.
  • FIG. l is a perspective view of a part of the sewing machine with the slide plate carrying the thread-cutting device removed from the side opening of the machine base plate;
  • FIG. 2 is an exploded view of the several parts of the threadcutting device.
  • FIG. 3 is a perspective view from below of the machine part of FIG. 1, likewise with the slide plate shown in the position outside of the base plate side opening.
  • FIGS. 1 and 3 of the drawings there is shown a sewing machine of conventional design having a machine base plate 1, a needle 2, a presser foot 3 and a cloth plate 4 with cloth advancing feed dogs 5 which are driven by a feed dog driving arm 6 in a known manner.
  • the machine base plate 1 has at its left hand side a side opening; 7 formed therein, the cloth plate 4 being secured at the inner end of this side opening.
  • the side edges of this opening 7 are grooved to form lateral guides for accommodating a slide plate 8 which in its closed position lies with its forward edge 9 against the rear edge of the cloth plate 4.
  • the slide plate covers the underlying space which accommodates a rotary loop-taking hook member 10 revolving about the bobbin for the lower thread (not shown) and cooperating with the needle carrying the upper thread for the formation of sewing stitches in a known manner.
  • the above-mentioned parts of the sewing machine are of conventional design and need, therefore, not be described in further detail.
  • a pneumatically actuated thread-cutting device is mounted against the lower side of the slide plate 8.
  • this thread-cutting device comprises a rectangular cylinder block 12 having a bore 13 in which a piston 14 secured to a piston rod 15 is arranged for reciprocating movement.
  • a U-shaped guide block 16 is fitted against the rear side of the cylinder block 12 and is secured to the latter by means of socket-head screws 17 passing through the legs of the guide block.
  • the central body portion of the U- shaped guide block forms an airtight closure for the open rear end of the cylinder bore 13 and is itself provided with a bore 18 for the passage of the piston rod 15, an O-ring 19 forming a seal between the piston rod and the wall of this bore.
  • the piston rod 15 thus extends rearwardly through the body portion and between the two legs of the U-shaped guide block 16.
  • a recessed guide way 20 is formed in the upper surface of the rectangular cylinder block 12 and extends above and in the direction of the axis of the cylinder bore 13 and the piston rod 15.
  • TA corresponding recessed guide way 21 is formed in the body portion of the guide block 16 and forms an extension of the guide way 20.
  • the upper edges at the inner sides of the legs of the U-shaped guide block 16 are recessed to form guide grooves 22 substantially in alignment with the guide way 20, 21.
  • a coupling member or slide block 23 of T-shape is secured onto the rear end of the piston rod 15, the body portion of this coupling member fitting between the legs of the guide block 16 and the laterally extending upper flange parts of the coupling member slidably engaging in the recessed guide grooves 22.
  • the upper surface of the coupling member 23 is coplanar with the bottom of the guide way 20, 21.
  • a flat elongated cutting knife 24 is disposed for reciprocating longitudinal sliding movement in the recessed guide way 20, 21.
  • the movable cutting knife 24 has at its forward end an integral hook portion 25 with a pointed end, and adjacent its rear end two holes 26 for receiving the upper ends of two pins 27 mounted in corresponding holes in the upper portion of the coupling member 23.
  • the elongated movable cutting knife 24 thus extends axially above the piston rod 15 and the cylinder bore 13 and on the actuation of the piston 14 this knife can be moved between a rear rest position in which the hook portion 25 still projects past the forward edge 9 of the slide plate 8 (FIG. 3) and a forward position (FIG. 1) in which the hook portion 25 may catch the sewing threads just below the cloth plate 4.
  • the cylinder block 12 and the guide block 16 are provided with conduits (not shown) which communicate with the cylinder bore on both sides of the piston 14 and in which threaded nipples 28 have been screwed for the connection of flexible tubes 29 leading to a suitable pneumatic control system (not shown).
  • a cover plate 30 is arranged against the upper side of the cylinder block 12 and the guide block 16 which cover plate thus confines the movable cutting knife 24 in its guide channel 20, 21.
  • the cover plate 30 has an integral forward extension of smaller width forming a stationary knife 31 projecting past the forward edge 9 of the slide plate 8 and disposed above the projecting hook portion 25 of the movable knife 24.
  • the stationary knife 31 is formed into a downwardly inclined cutting edge 32.
  • a recess 33 has been formed in the bottom of the guide way 20 adjacent the forward end of the cylinder block 12 and a curved leaf spring 34 is disposed in this recess so as to press the movable cutting knife 24 against the cutting edge 32 of the stationary knife 31.
  • the slide plate 8 has four holes 35 arranged in alignment with elongated holes 36 in the cover plate 30 and with threaded holes 37 in the cylinder block 12 and the guide block 16, respectively. Screws 38 of the socket-head type passing through the holes 35 and 36 are screwed into the threaded holes 37 which screws on being tightened thus firmly secure the cylinder block and the guide block to the slide plate 8.
  • elongated holes 36 in the cover plate 30 allow the position of the latter to be adjusted lengthwise for the proper adjustment of the position of the cutting edge 32 of the stationary knife 31 with respect to the hook portion 25 of the movable knife 24.
  • the dimensions of the combined cylinder block and guide block are such that the device easily fits underneath the slide plate 8, the height of this combined block being small enough to leave sufficient room for the bobbon of the lower thread of the sewing machine to be mounted in the usual manner on the rotary hook member 10.
  • a clamping member 39 has been secured by means of a screw bolt 40 against the lower side of the slide plate which clamping members project laterally past the side edges of the slide plate 8 and are adapted to engage underneath the side edge portions of the opening 7 in the base plate 1 whereby the slide plate can be firmly but removably secured in this opening by tightening the bolts 40.
  • the slide plate 8 of machine is removed from the base plate 1 and the four holes 35 for the passage of the screws 38 and two screw holes 41 for receiving the clamping bolts 40 are bored in this slide plate.
  • the device is then secured against the lower side of the slide plate by means of the socket-head screws 38.
  • the slide plate 8 is placed into the opening 7 and secured to the base plate 1 by means of the clamping members 39 and bolts 40.
  • the flexible tubes 29 may be connected to any suitable pneumatic control system for actuating the thread-cutting device.
  • the tubes 29 can be connected to electromagnetically actuated valves which are controlled in the manner as described in applicants copending patent application Ser. No. 784,770, filed Dec. 18, 1968, now patent No. 3,578,770.
  • That threadcutting device is actuated when the needle 2 has reached its highest position whereby the piston 14 in the cylinder bore 13 is driven pneumatically from its left hand rest position to the right (as seen in FIGS. 1 and 3).
  • the hook portion 25 of the movable cutting knife 24 thus moves forwardly close beneath the cloth plate 4 and seizes the sewing threads in its hook.
  • the piston is returned to its rest position whereby the hook portion 25 carries the sewing threads along towards the cutting edge 32 of the stationary knife 31 to cut the threads at this cutting edge.
  • a sewing machine with a threadcutting device said sewing machine including a machine base plate having a side opening therein, a cloth plate mounted in said base plate side opening, stitch forming means arranged in the space extending underneath said base plate, cloth plate and side opening, and a removable slide plate slidably mounted in said base plate side opening with its front edge adjacent said cloth plate and allowing access to said space
  • said thread-cutting device comprising a cylinder block provided with a bore and having a smaller width than said slide plate, said block being mounted against the lower side of the slide plate within the lateral extension of said slide plate and with the axis of said bore extending substantially normal to the slide plate front edge, a piston member arranged in said bore for reciprocating movement therein, a piston rod secured to said piston member and extending from the latter rearwardly in a direction away from said slide plate forward edge, pneumatic means connected with said cylinder block for driving said piston in said bore with a reciprocating movement, said cylinder block having a recessed guide way formed in its upper face
  • a thread-cutting device for a sewing machine of the type having a base plate with a side opening and a slide plate arranged in this side opening, said thread'cutting device com prising a cylinder block having a smaller width than said sewing machine slide plate and adapted to be mounted against the lower side of said slide plate, said cylinder block having a bore and a forward and a rear end, a piston member arranged in said bore for reciprocating movement therein, a piston rod secured to said piston member and extending from the latter rearwardly past said cylinder block rear end, said cylinder block having means adapted to connect the same to pneumatic actuating means for driving said piston in said bore with a reciprocating movement, said cylinder block further having a recessed guide way formed in its upper surface and extending parallel to the axis of said bore between said forward and rear end of said block, a movable cutting knife having a hookshaped forward end and a flat straight body portion arranged for reciprocating sliding movement in said guide way in a position in which said knife forward end projects past said
  • the tread-cutting device of claim 5 further comprising a guide block secured against said cylinder block rear end forming a guide for said coupling member and for said body portion of the movable cutting knife, said guide block being likewise covered by said cover plate.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US32032A 1969-11-13 1970-04-27 Thread-cutting device for sewing machines Expired - Lifetime US3648634A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6917054A NL6917054A (enrdf_load_stackoverflow) 1969-11-13 1969-11-13

Publications (1)

Publication Number Publication Date
US3648634A true US3648634A (en) 1972-03-14

Family

ID=19808371

Family Applications (1)

Application Number Title Priority Date Filing Date
US32032A Expired - Lifetime US3648634A (en) 1969-11-13 1970-04-27 Thread-cutting device for sewing machines

Country Status (11)

Country Link
US (1) US3648634A (enrdf_load_stackoverflow)
BE (1) BE748929A (enrdf_load_stackoverflow)
CH (1) CH508082A (enrdf_load_stackoverflow)
DE (1) DE2025187A1 (enrdf_load_stackoverflow)
DK (1) DK125657B (enrdf_load_stackoverflow)
ES (1) ES379539A1 (enrdf_load_stackoverflow)
FR (1) FR2071598A5 (enrdf_load_stackoverflow)
GB (1) GB1281609A (enrdf_load_stackoverflow)
IE (1) IE34112B1 (enrdf_load_stackoverflow)
NL (1) NL6917054A (enrdf_load_stackoverflow)
SE (1) SE359871B (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3709176A (en) * 1971-10-08 1973-01-09 Singer Co Underbed thread trimming mechanism for sewing machines
US3810439A (en) * 1970-06-09 1974-05-14 M Giesselmann Arrangement for cutting the threads in a sewing machine when changing the bobbin thread
FR2322955A1 (fr) * 1975-09-02 1977-04-01 Union Special Maschinenfab Dispositif separateur de fil pour machines a coudre a point de chainette
EP0042822A1 (en) * 1980-06-19 1981-12-30 Ditta PRANDI di Elvezio Prandi Thread cutting device for sewing machines
WO1989005369A1 (en) * 1987-12-03 1989-06-15 Atlanta Attachment Company Thread undercut attachment for a multi-needle sewing machine
US5333565A (en) * 1992-10-30 1994-08-02 Mim Industries, Inc. Thread cutting via reciprocating arm with pockets and a trimming plate
US5647290A (en) * 1994-10-13 1997-07-15 Durkopp Adler Ag Thread-cutting mechanism for eyelet-button hole sewing machine
CN1036017C (zh) * 1993-09-18 1997-10-01 高林股份有限公司 多支针缝纫机的线切断装置
CN1036214C (zh) * 1994-04-08 1997-10-22 高林股份有限公司 多支针缝纫机的线切断装置
US6286445B1 (en) * 1999-09-24 2001-09-11 Clinton Industries, Inc. Unitary double-acting piston thread cutter assembly
US6779472B1 (en) * 2003-03-25 2004-08-24 Sara Lee Corporation Hosiery toe closing apparatus and method
EP1582615A3 (de) * 2004-04-01 2006-09-27 Dürkopp Adler Aktiengesellschaft Nähmaschine
EP2206820A1 (de) * 2009-01-09 2010-07-14 Dürkopp Adler AG Fadenschneidvorrichtung
US20120031316A1 (en) * 2008-02-07 2012-02-09 Brother Kogyo Kabushiki Kaisha Thread cutter for sewing machine
CN105129500A (zh) * 2015-07-16 2015-12-09 合肥奥瑞数控科技有限公司 能够自由固定的升降座
CN105133215A (zh) * 2015-09-19 2015-12-09 浙江中捷缝纫科技有限公司 一种缝纫机的剪线机构
CN105129482A (zh) * 2015-07-16 2015-12-09 合肥奥瑞数控科技有限公司 控制式压布器的固定装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3489115A (en) * 1967-07-07 1970-01-13 Rimoldi C Spa Virginio Device for simultaneously cutting the sewing threads in a sewing machine
US3524420A (en) * 1968-02-23 1970-08-18 Gunter Peschke Yarn separating device for sewing machines

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3489115A (en) * 1967-07-07 1970-01-13 Rimoldi C Spa Virginio Device for simultaneously cutting the sewing threads in a sewing machine
US3524420A (en) * 1968-02-23 1970-08-18 Gunter Peschke Yarn separating device for sewing machines

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3810439A (en) * 1970-06-09 1974-05-14 M Giesselmann Arrangement for cutting the threads in a sewing machine when changing the bobbin thread
US3709176A (en) * 1971-10-08 1973-01-09 Singer Co Underbed thread trimming mechanism for sewing machines
FR2322955A1 (fr) * 1975-09-02 1977-04-01 Union Special Maschinenfab Dispositif separateur de fil pour machines a coudre a point de chainette
EP0042822A1 (en) * 1980-06-19 1981-12-30 Ditta PRANDI di Elvezio Prandi Thread cutting device for sewing machines
WO1989005369A1 (en) * 1987-12-03 1989-06-15 Atlanta Attachment Company Thread undercut attachment for a multi-needle sewing machine
US4886005A (en) * 1987-12-03 1989-12-12 Atlanta Attachment Company Thread undercut attachment for a multi-needle sewing machine
US5333565A (en) * 1992-10-30 1994-08-02 Mim Industries, Inc. Thread cutting via reciprocating arm with pockets and a trimming plate
CN1036017C (zh) * 1993-09-18 1997-10-01 高林股份有限公司 多支针缝纫机的线切断装置
CN1036214C (zh) * 1994-04-08 1997-10-22 高林股份有限公司 多支针缝纫机的线切断装置
US5647290A (en) * 1994-10-13 1997-07-15 Durkopp Adler Ag Thread-cutting mechanism for eyelet-button hole sewing machine
US6286445B1 (en) * 1999-09-24 2001-09-11 Clinton Industries, Inc. Unitary double-acting piston thread cutter assembly
US6779472B1 (en) * 2003-03-25 2004-08-24 Sara Lee Corporation Hosiery toe closing apparatus and method
EP1582615A3 (de) * 2004-04-01 2006-09-27 Dürkopp Adler Aktiengesellschaft Nähmaschine
US20120031316A1 (en) * 2008-02-07 2012-02-09 Brother Kogyo Kabushiki Kaisha Thread cutter for sewing machine
US8312824B2 (en) * 2008-02-07 2012-11-20 Brother Kogyo Kabushiki Kaisha Thread cutter for sewing machine
EP2206820A1 (de) * 2009-01-09 2010-07-14 Dürkopp Adler AG Fadenschneidvorrichtung
CN105129500A (zh) * 2015-07-16 2015-12-09 合肥奥瑞数控科技有限公司 能够自由固定的升降座
CN105129482A (zh) * 2015-07-16 2015-12-09 合肥奥瑞数控科技有限公司 控制式压布器的固定装置
CN105129500B (zh) * 2015-07-16 2017-03-22 合肥奥瑞数控科技有限公司 能够自由固定的升降座
CN105133215A (zh) * 2015-09-19 2015-12-09 浙江中捷缝纫科技有限公司 一种缝纫机的剪线机构

Also Published As

Publication number Publication date
NL6917054A (enrdf_load_stackoverflow) 1971-05-17
DE2025187A1 (de) 1971-05-19
IE34112B1 (en) 1975-02-05
FR2071598A5 (enrdf_load_stackoverflow) 1971-09-17
IE34112L (en) 1971-05-13
ES379539A1 (es) 1973-09-16
SE359871B (enrdf_load_stackoverflow) 1973-09-10
DK125657B (da) 1973-03-19
CH508082A (de) 1971-05-31
BE748929A (nl) 1970-09-16
GB1281609A (en) 1972-07-12

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