EP0042822A1 - Thread cutting device for sewing machines - Google Patents
Thread cutting device for sewing machines Download PDFInfo
- Publication number
- EP0042822A1 EP0042822A1 EP81830087A EP81830087A EP0042822A1 EP 0042822 A1 EP0042822 A1 EP 0042822A1 EP 81830087 A EP81830087 A EP 81830087A EP 81830087 A EP81830087 A EP 81830087A EP 0042822 A1 EP0042822 A1 EP 0042822A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- hook
- cylinder
- support plate
- cutting device
- thread cutting
- 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.)
- Withdrawn
Links
- 238000009958 sewing Methods 0.000 title claims description 4
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 6
- 239000013536 elastomeric material Substances 0.000 claims abstract description 3
- 230000010355 oscillation Effects 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 150000001247 metal acetylides Chemical class 0.000 claims abstract 2
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 2
- 239000006096 absorbing agent Substances 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
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
-
- 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
- the subject of the present invention is a thread cutting device for a sewing machine, comprising:
- the device forming the subject of the present invention is principally characterised by the fact that the cylinder of the actuator is fixed directly to the support plate and is provided with an aperture in its central part, and in that the piston is provided centrally with a transverse arm which passes through the said aperture in the cylinder and drives, by means of a pin and groove coupling, the oscillations of the hook-shaped cutter.
- a support plate adapted to be fixed to a sewing machine in place of the throat plate is indicated by the reference numeral 1.
- a cylinder forming part of a fluid pressure actuator is indicated with the reference numeral 2.
- the cylinder 2 is provided with end flanges 3 having a square form.
- One of the edges of each of the two flanges 3 is provided with a pair of holes 3a for the direct fixing of the cylinder 2 to the underside of the support plate 1 by means of screws 4.
- a cylindrical plunger comprising a piston which is mounted slidably within the cylinder 2, is indicated with the reference numeral 8.
- the plunger 8 is provided, near each of its ends, with a groove 9 in which is housed a toroidal sealing ring 10.
- each of the two ends of the plunger 8 there is screwed a screw 11 intended for the adjustment of the stroke of the plunger 8 within the cylinder 2, which is driven in two directions by fluid under pressure (air or oil) entering one or the other of the two ends of the cylinder through one of the unions 7.
- the thin plates 5 In addition to the function of effecting a seal between the cylinder 2 and the end plates 6, the thin plates 5 also have the function of damping the shocks as the slidable plunger 8 strikes against the end plates themselves, thus significantly reducing the operating noise of the device.
- the direct fixing of the cylinder 2 to the support plate 1 makes the device very compact and resistant to applied forces .
- the plunger 8 is provided in its central part with a groove 12 to which there is fixed, by means of a screw 13, an arm 14 which passes out from the cylinder 2 through a wide aperture 2a formed in the central part of the cylinder.
- the arm 14 is provided at is free end with a transverse projection 15 having a longitudinal groove 16.
- In the groove 16 engages a pin 17 carried by a hook-shaped cutter 18 pivoted below the plate 1 by means of a screw 19, such that the reciprocating axial displacement of the plunger produces a reciprocating angular displacement of the hook-shaped cutter 18 about the screw 19.
- a guide plate for the cutter having an elongate form and directed orthogonally with respect to the longitudinal axis of the cylinder 2, is indicated with the reference numeral 20.
- the plate 20 is fixed to the support plate 1 by means of a screw 21 and has a pin 22 which engages in a hole of the plate 1.
- the counter-blade 23 has an attachment part 23a provided with a hole for fixing, by means of a screw 24, to the support plate 1, and a flat part 23b which is reduced in thickness and which ends with a cutting edge 23c shaped in the form of a transverse ridge and intended to cooperate with the hook-shaped cutter 18.
- the counter-blade 23 can be made in a hard metal, such as a metal carbide.
- the characteristic form of the counter-blade according to the invention makes it possible to use a hook-shaped cutter of greater thickness and therefore of greater strength than known cutters, as well as strengthening the transport member (not shown in the drawings) which has a slot for the passage of the hook and into which the counter-blade partly penetrates.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
To control the oscillation of a hook-shaped cutter (18), the device uses a fluid pressure actuator fixed directly beneath the throat plate(1) and operating the hook by means of an arm (14) connected directly to the central part of a slidable plunger (8) within the cylinder (2). The cylinder is provided with flanges (3) to which are connected end plates (6) with the interposition of sealing sheets of elastomeric material (5) serving as shock absorbers. The hook-shaped cutter cooperates with a rectilinear counter-blade (23) which is lightened towards the point and can be made from hard metal such as metal carbides.
Description
- The subject of the present invention is a thread cutting device for a sewing machine, comprising:
- - a support plate serving as a throat plate
- - an actuator supported below the support plate and constituted by a cylinder supplied with a fluid under pressure at its two ends, and a piston slidably mounted in the cylinder,
- - a hook-shaped cutter pivoted to the support plate and driven by the said piston to effect angular displacements in two directions,
- - a guide plate for the cutter carried by the support plate,
- - a resilient counter-blade fixed to the support plate and cooperating with a hook-shaped cutter for cutting the thread gripped by the hook.
- The device forming the subject of the present invention is principally characterised by the fact that the cylinder of the actuator is fixed directly to the support plate and is provided with an aperture in its central part, and in that the piston is provided centrally with a transverse arm which passes through the said aperture in the cylinder and drives, by means of a pin and groove coupling, the oscillations of the hook-shaped cutter.
- By virtue of this characteristic, there is obtained a better sliding of the movable plunger and better resistance to stresses which occur during cutting, particularly in the case of thick threads.
- Further characteristics and advantages of the present invention will become apparent from the description which follows, made with reference to the attached drawings, provided purely by way of non-limitative example, in which:
- Figure 1 is a perspective view from below of a thread cutting device according to the invention,
- Figure 2 is an exploded view of Figure 1,
- Figure 3 is an exploded view of a detail of the actuator,
- Figure 4 is a longitudinal axial section of the actuator,
- Figure 5 is a perspective view of the counter-blade, and
- Figure 6 is a sectional view illustrating the cooperation between the counter-blade and the hook-shaped cutter.
- A support plate adapted to be fixed to a sewing machine in place of the throat plate is indicated by the reference numeral 1. A cylinder forming part of a fluid pressure actuator (pneumatic or hydraulic) is indicated with the
reference numeral 2. Thecylinder 2 is provided withend flanges 3 having a square form. One of the edges of each of the twoflanges 3 is provided with a pair ofholes 3a for the direct fixing of thecylinder 2 to the underside of the support plate 1 by means ofscrews 4. - To each
flange 3 there is fixed, with the interposition of athin plate 5 of elastomeric material, anend plate 6 carrying aunion 7 for the supply of fluid under pressure. A cylindrical plunger, comprising a piston which is mounted slidably within thecylinder 2, is indicated with thereference numeral 8. Theplunger 8 is provided, near each of its ends, with agroove 9 in which is housed atoroidal sealing ring 10. - In the central part of each of the two ends of the
plunger 8 there is screwed ascrew 11 intended for the adjustment of the stroke of theplunger 8 within thecylinder 2, which is driven in two directions by fluid under pressure (air or oil) entering one or the other of the two ends of the cylinder through one of theunions 7. - In addition to the function of effecting a seal between the
cylinder 2 and theend plates 6, thethin plates 5 also have the function of damping the shocks as theslidable plunger 8 strikes against the end plates themselves, thus significantly reducing the operating noise of the device. The direct fixing of thecylinder 2 to the support plate 1 makes the device very compact and resistant to applied forces . - The
plunger 8 is provided in its central part with agroove 12 to which there is fixed, by means of ascrew 13, anarm 14 which passes out from thecylinder 2 through awide aperture 2a formed in the central part of the cylinder. Thearm 14 is provided at is free end with atransverse projection 15 having alongitudinal groove 16. In thegroove 16 engages a pin 17 carried by a hook-shaped cutter 18 pivoted below the plate 1 by means of ascrew 19, such that the reciprocating axial displacement of the plunger produces a reciprocating angular displacement of the hook-shaped cutter 18 about thescrew 19. - A guide plate for the cutter, having an elongate form and directed orthogonally with respect to the longitudinal axis of the
cylinder 2, is indicated with thereference numeral 20. Theplate 20 is fixed to the support plate 1 by means of ascrew 21 and has apin 22 which engages in a hole of the plate 1. A counter-blade intended to cooperate with the hook-shaped cutter 18, to effect cutting of a thread gripped by this cutter, is indicated with thereference numeral 23. Thecounter-blade 23 has anattachment part 23a provided with a hole for fixing, by means of ascrew 24, to the support plate 1, and aflat part 23b which is reduced in thickness and which ends with a cutting edge 23c shaped in the form of a transverse ridge and intended to cooperate with the hook-shaped cutter 18. - Due to this configuration, the
counter-blade 23 can be made in a hard metal, such as a metal carbide. Moreover, the characteristic form of the counter-blade according to the invention makes it possible to use a hook-shaped cutter of greater thickness and therefore of greater strength than known cutters, as well as strengthening the transport member (not shown in the drawings) which has a slot for the passage of the hook and into which the counter-blade partly penetrates. - It will also be noted that the disposition and form of the
guide plate 20 described above makes it possible to prevent pieces of cut thread from lodging between this guide plate and the support plate 1. - Naturally, the principle of the invention remaining the same, the details of construction and the embodiments of the device can be widely varied without by this departing from the scope of the present invention.
Claims (6)
1. A thread cutting device for a sewing machine, comprising:
characterised by the fact that the cylinder (2) of the actuator is fixed directly to the support plate (1) and is provided with an aperture (2a) in its central part, and in that the piston (8) is provided centrally with a transverse arm (14) which passes through the said aperture (2a) of the cylinder (2) and drives the oscillations of the hook-shaped cutter (18) by means of a pin and groove coupling (17,18).
- a support plate serving as a throat plate,
- an actuator supported beneath the support plate and constituted by a cylinder supplied with a fluid under pressure at its two ends, and a piston slidably mounted in the cylinder,
- a hook-shaped cutter pivoted to the support plate and driven by the said piston to effect angular displacements in two directions,
- a guide plate for the cutter, carried by the support plate,
- a resilient counter-blade fixed to the support plate and cooperating with the hook-shaped cutter for cutting the thread gripped by the hook,
characterised by the fact that the cylinder (2) of the actuator is fixed directly to the support plate (1) and is provided with an aperture (2a) in its central part, and in that the piston (8) is provided centrally with a transverse arm (14) which passes through the said aperture (2a) of the cylinder (2) and drives the oscillations of the hook-shaped cutter (18) by means of a pin and groove coupling (17,18).
2. A thread cutting device according to Claim 1, characterised by the fact that the piston (8) is in the form of an elongate cylindrical body provided, near each end, with a groove (9) housing an annular seal (10) and, on each end, having a screw (11) serving for the adjustment of the stroke of the piston.
3. A thread cutting device according to Claim 1, characterised by the fact that the cylinder (2) of the actuator is provided at each end with a flange (3), fixed by means of screws (4) to the support plate (1), and in that against each flange (3) there is fixed, with the interposition of a sealing plate (5) of elastomeric material, an end plate (6) carrying a pipe union (7) for the supply of fluid under pressure.
4. A thread cutting device according to Claim 1, characterised by the fact that the guide plate (20) of the hook-shaped cutter (18) is of elongate form and extends in a transverse direction with respect to the axis of the cylinder (2) of the actuator.
5. A thread cutting device according to Claim 1, characterised by the fact that the counter-blade (23) is in the form of a flat plate of reduced thickness having at one end a thickened attachment region (23a) and at the opposite end a sharpened edge (23c) in the form of a transverse ridge intended to cooperate with a hook-shaped cutter (18).
6. A thread cutting device according to Claim 5, characterised by the fact that the counter-blade is made of a hard metal, particularly metal carbides.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67961/80A IT1128812B (en) | 1980-06-19 | 1980-06-19 | THREAD CUTTER DEVICE FOR SEWING MACHINES |
IT6796180 | 1980-06-19 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0042822A1 true EP0042822A1 (en) | 1981-12-30 |
Family
ID=11306740
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP81830087A Withdrawn EP0042822A1 (en) | 1980-06-19 | 1981-06-02 | Thread cutting device for sewing machines |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0042822A1 (en) |
ES (1) | ES8204005A1 (en) |
IT (1) | IT1128812B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1582615A2 (en) * | 2004-04-01 | 2005-10-05 | Dürkopp Adler Aktiengesellschaft | Sewing machine |
KR100871596B1 (en) | 2005-08-29 | 2008-12-02 | 야마토 미싱 세이조 가부시키가이샤 | Sewing machine with thread cutter |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3369509A (en) * | 1966-01-03 | 1968-02-20 | Sunbrand Corp | Cutting mechanism for sewing machines |
US3648634A (en) * | 1969-11-13 | 1972-03-14 | Dejong & Devlieger Machinehand | Thread-cutting device for sewing machines |
FR2360702A1 (en) * | 1976-03-31 | 1978-03-03 | Union Special Gmbh | DEVICE ALLOWING THE SEWING THREAD TO BE SEPARATED FROM PIECES OF ETOFFE PASSING THROUGH THE STITCH FORMING ZONE OF A SEWING MACHINE |
US4202286A (en) * | 1978-03-28 | 1980-05-13 | Industrias P. Freire, S.A. | Universal thread cutting device and complementary devices applicable to sewing machines |
-
1980
- 1980-06-19 IT IT67961/80A patent/IT1128812B/en active
-
1981
- 1981-06-02 EP EP81830087A patent/EP0042822A1/en not_active Withdrawn
- 1981-06-08 ES ES502841A patent/ES8204005A1/en not_active Expired
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3369509A (en) * | 1966-01-03 | 1968-02-20 | Sunbrand Corp | Cutting mechanism for sewing machines |
US3648634A (en) * | 1969-11-13 | 1972-03-14 | Dejong & Devlieger Machinehand | Thread-cutting device for sewing machines |
FR2360702A1 (en) * | 1976-03-31 | 1978-03-03 | Union Special Gmbh | DEVICE ALLOWING THE SEWING THREAD TO BE SEPARATED FROM PIECES OF ETOFFE PASSING THROUGH THE STITCH FORMING ZONE OF A SEWING MACHINE |
US4202286A (en) * | 1978-03-28 | 1980-05-13 | Industrias P. Freire, S.A. | Universal thread cutting device and complementary devices applicable to sewing machines |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1582615A2 (en) * | 2004-04-01 | 2005-10-05 | Dürkopp Adler Aktiengesellschaft | Sewing machine |
JP2005288177A (en) * | 2004-04-01 | 2005-10-20 | Duerkopp Adler Ag | Sewing machine |
EP1582615A3 (en) * | 2004-04-01 | 2006-09-27 | Dürkopp Adler Aktiengesellschaft | Sewing machine |
JP4734010B2 (en) * | 2004-04-01 | 2011-07-27 | デュルコップ アードラー アクチエンゲゼルシャフト | sewing machine |
KR100871596B1 (en) | 2005-08-29 | 2008-12-02 | 야마토 미싱 세이조 가부시키가이샤 | Sewing machine with thread cutter |
Also Published As
Publication number | Publication date |
---|---|
IT8067961A0 (en) | 1980-06-19 |
ES8204005A1 (en) | 1982-07-01 |
IT1128812B (en) | 1986-06-04 |
ES502841A0 (en) | 1982-05-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4623420A (en) | Anvil for ultrasonic slitting apparatus | |
AU693275B2 (en) | Device for guiding and centring a machine component | |
US3753624A (en) | Boring tool for small diameters | |
US4614307A (en) | Apparatus for the granulating of plastic material with axial adjustment of the cutting head | |
EP0042822A1 (en) | Thread cutting device for sewing machines | |
US4825741A (en) | Reciprocatory machine tool | |
US4080860A (en) | Press | |
US5368420A (en) | Rotating drill head with a boring bar which is pivotable by a slight distance vertically to the axis of rotation by fluidic means | |
US4993152A (en) | Dry-shaving apparatus | |
US3857316A (en) | Shear cutter | |
US5988042A (en) | Rodless cylinder with internal bearings | |
US3524374A (en) | Shearing machine for continuous metal sheet | |
US2358950A (en) | Valve | |
US4091756A (en) | Pneumatically driven thread cutter | |
KR910012397A (en) | High Speed Cutting Machine for Aramid | |
US3926083A (en) | Die set with two-part leader pins | |
US3136058A (en) | Hair clipper blade drive in a vibratory type clipper | |
US5390698A (en) | Plate-type, unidirectional-flow, fluid control valve | |
DE3467108D1 (en) | Pneumatically operating device comprising means for limiting the displacement of a piston | |
US4506578A (en) | Pneumatic apparatus for actuating metal shear | |
US20020152866A1 (en) | Blade holder with schock absorber for a device for longitudinally cutting a material strip | |
US3787970A (en) | Bevelling tool | |
US2794424A (en) | Transmitter-controlled hydraulic servomotor apparatus | |
US2324374A (en) | Apparatus for drilling diamonds and like purposes | |
US3187638A (en) | Portable air saw |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB NL SE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19821209 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PRANDI, ELVEZIO |