EP3006615B1 - Nähmaschine - Google Patents

Nähmaschine Download PDF

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Publication number
EP3006615B1
EP3006615B1 EP15193321.5A EP15193321A EP3006615B1 EP 3006615 B1 EP3006615 B1 EP 3006615B1 EP 15193321 A EP15193321 A EP 15193321A EP 3006615 B1 EP3006615 B1 EP 3006615B1
Authority
EP
European Patent Office
Prior art keywords
thread cutting
main shaft
cam
angle
motor
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.)
Active
Application number
EP15193321.5A
Other languages
English (en)
French (fr)
Other versions
EP3006615A1 (de
Inventor
Takashi Nittou
Yoshitaka Tsuchikawa
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.)
Juki Corp
Original Assignee
Juki Corp
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
Priority claimed from JP2009236493A external-priority patent/JP5555470B2/ja
Priority claimed from JP2009236454A external-priority patent/JP2011083320A/ja
Application filed by Juki Corp filed Critical Juki Corp
Publication of EP3006615A1 publication Critical patent/EP3006615A1/de
Application granted granted Critical
Publication of EP3006615B1 publication Critical patent/EP3006615B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D05B19/00—Programme-controlled sewing machines
    • D05B19/02—Sewing machines having electronic memory or microprocessor control unit
    • D05B19/12—Sewing machines having electronic memory or microprocessor control unit characterised by control of operation of machine
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/10—Electrical or electromagnetic drives

Definitions

  • the sewing machine is configured to perform two different controls for thread cutting. That is, when a pedal is backwardly operated (heel-pedaled) while the main shaft is being stopped at the lower stop position, the motor is driven to rotate the main shaft at a certain speed and the thread cutting solenoid is turned on. When the pedal is backwardly operated directly from a forwardly pedaled condition while a sewing machine is being driven, the thread cutting solenoid is turned on after decelerating the main shaft to a certain level.
  • the sewing machine 10 further includes, as shown in Fig. 2 , a cloth feeding mechanism 20 including a feed dog which protrudes from an opening formed in a throat plate to feed a workpiece in a cloth feeding direction, a thread cutting mechanism 30 which includes a movable knife 31 and a fixed knife 33 and cuts the upper thread and the lower thread, and a thread cutting drive mechanism 50 which applies a cutting operation to the movable knife 31 of the thread cutting mechanism 30.
  • a cloth feeding mechanism 20 including a feed dog which protrudes from an opening formed in a throat plate to feed a workpiece in a cloth feeding direction
  • a thread cutting mechanism 30 which includes a movable knife 31 and a fixed knife 33 and cuts the upper thread and the lower thread
  • a thread cutting drive mechanism 50 which applies a cutting operation to the movable knife 31 of the thread cutting mechanism 30.
  • the horizontal shuttle mechanism includes a shuttle shaft 11 supported rotatably along the Y-axis direction inside the bed portion 2, and a full rotary shuttle (not shown) coupled to the tip end of the shuttle shaft 11 and including an outer shuttle which rotates around the axis of the shuttle shaft 11.
  • the shuttle shaft 11 is coupled to the motor 1 ( Fig. 1 ) so as to rotate at a speed twice the speed of the main shaft.
  • the cloth feeding mechanism 20 includes a feed base 21 having a feed dog (not shown) provided on the upper surface which protrudes from an opening of the throat plate, an up-down feed shaft 22 which is driven to rotate by the motor 1, a horizontal feed shaft 23 which is rotated in a reciprocating manner by the motor 1, an eccentric cam 24 fixed to the up-down feed shaft 22, an up-down feed rod 25 having one end portion coupled to an eccentric shaft of the eccentric cam 24 and the other end portion coupled to the rear end portion of the feed base 21, and a horizontal feed arm 26 which swings its swinging end portion fixed to and supported on the horizontal feed shaft 23 and coupled to the feed base 21 in the front-rear direction.
  • the up-down feed shaft 22 is coupled to the main shaft via a belt not shown so that when the main shaft rotates one revolution, the up-down feed shaft 22 also rotates one revolution at the same period as that of the main shaft.
  • the movable knife 31 is axially supported on the main body frame 32 by a shoulder screw 35 so as to turn between a standby position shown by the alternate long and two short dashed line and a most retreated position shown by the solid line.
  • the movable knife 31 is normally spaced from the shown stitch point S at the standby position, and reciprocates when cutting (thread cutting operation), and when moving forward, retreats to the solid-line position and handles (divides) sewing threads (upper thread and lower thread) to be cut, and when returning, captures a sewing thread to be cut during forward movement to the standby position, and cuts the captured sewing thread at the standby position in cooperation with the fixed knife 33.
  • the edge portion 33a of the fixed knife 33 sandwiches and cuts a sewing thread with the edge portion 31 a of the movable knife 31 when the movable knife 31 advances.
  • the input portion 53a, the base portion 53c, and the position restricting projection 53d of the knife drive arm 53 are positioned lower than the up-down feed shaft 22, horizontal feed shaft 23, and the shuttle shaft 11, and the output portion 53b is positioned higher than the up-down feed shaft 22, horizontal feed shaft 23, and the shuttle shaft 11.
  • the pivot shaft 54 is provided with two E-rings or two thrust collars to support both ends in the Y-axis direction of the knife drive arm 53. It is also easily conceivable that a stepped portion is provided on one end side of the pivot shaft 54, and after the knife drive arm 53 is fitted, the other end side is locked by an E-ring or the like.
  • the knife drive arm 53 is supported rotatably, and the knife drive arm 53 moves in the Y-axis direction according to movement in the Y-axis direction of the pivot shaft 54.
  • the first stopper 57 has a recess 57a on the right of the position restricting projection 53d, and an engagement maintaining projection 57b projecting leftward for maintaining engagement of the roller 52 in the cam groove 51a is formed adjacent to the front side of the recess 57a.
  • the link body 58 joins the knife drive arm 53 and the first turning piece 64 (first L-shaped turning link) of the knife position adjuster 59, and has a function to transmit advancing and retreating movements substantially along the X-axis direction of the output portion 53b of the knife drive arm 53 to the turning end portion of the first turning piece 64.
  • the output portion 53b of the knife drive arm 53 is displaced in the X-axis direction and the Z-axis direction due to the turning movement
  • the first turning piece 64 is displaced in the X-axis direction and the Y-axis direction due to the turning movement.
  • the position of the knife drive arm 53 is also switched along the pivot shaft 54 (Y-axis direction).
  • the control device 100 includes a ROM 102 storing programs for executing various controls described later of the sewing machine 10 and various set data, a CPU 101 which executes various programs stored in the ROM 102, a RAM 103 which becomes a work area for temporarily storing data when executing programs of the CPU 101, an EEPROM 104 for storing various data the settings of which are changeable and predetermined programs, a drive circuit 105 of the motor 1 described above, an operation panel 109 for inputting various commands and settings into the sewing machine, an interface circuit 106 of the operation panel 109, a thread cutting drive circuit 107 of the above-described thread cutting solenoid 56, and a pedal sensor 108 provided in a pedal to input sewing start, interruption, and thread cutting execution, etc., and detect a pedal operating position.
  • a ROM 102 storing programs for executing various controls described later of the sewing machine 10 and various set data
  • a CPU 101 which executes various programs stored in the ROM 102
  • a RAM 103 which becomes a work area for temporarily
  • the table data shown in Fig. 9 using the lower stop angle ⁇ 1 which is a stop position of the main shaft and the value of the thread cutting rotation speed v1 as parameters are stored in advance in the ROM 102 or the EEPROM 104.
  • Step S34 the thread cutting solenoid 56 is turned on (Step S34), and an elapsed time t from driving is clocked (step S35). Then, it is judged whether the elapsed time t has exceeded the delay time T (Step S36), and when the delay time T elapses, the motor 1 is driven at the thread cutting rotation speed v1 (Step S37).
  • the thread cutting cam 51 rotates according to rotation of the up-down feed shaft 22 interlocking with the main shaft, and when the roller 52 comes to the cam operation section, the knife drive arm 53 is turned counterclockwise in Fig. 4 . Accordingly, via the first link body 58, the knife position adjuster 59 is rotated clockwise in Fig. 2 .
  • Step S38 it is judged whether the rotation angle ⁇ 2 of the main shaft has reached a set main shaft angle (for example, 53 degrees) which is the upper stop position from outputs of the encoder 14 and the needle position detector 15 (Step S38).
  • a set main shaft angle for example, 53 degrees
  • the motor 1 is stopped (Step S39), and driving of the thread cutting solenoid 56 is stopped (Step S40). Accordingly, the first cutting control is ended.
  • the rotation speed (thread cutting rotation speed v2) of the motor 1 in the thread cutting operation can be optionally set in the range from 180 to 500 rpm from the operation panel 109 (speed setting means), and the set value is stored in the EEPROM 104, and read out when performing thread cutting.
  • the rotation speed (thread cutting rotation speed v2) of the motor 1 can be set to an arbitrary value, so that when the timing (main shaft angle) to start driving of the thread cutting solenoid 56 is fixed, the timing of completion of the engagement of the roller 52 by the thread cutting solenoid 56 varies according to the thread cutting rotation speed v2 of the motor 1.
  • the thread cutting solenoid 56 is actuated and the timing of completion of the engagement of the roller 52 with the cam groove 51a delays, and the engagement may not be completed before the above-described cam operation section.
  • the timing of completion of the engagement of the roller 52 by the thread cutting solenoid 56 or the operation timing of the shuttle presser 13 becomes a fixed target timing.
  • the timing (main shaft angle) to start driving of the thread cutting solenoid 56 with respect to the thread cutting rotation speed v2 of the motor 1 is determined in the table of Fig. 11 , and the table is prepared in advance in the EEPROM 104 or ROM 102.
  • the delay time may be obtained by the above-described calculation each time of the second cutting control.
  • Step S66 it is judged whether the current upper stop angle has reached the set main shaft angle (for example, 53 degrees) of the upper stop position ⁇ 2 from outputs of the encoder 14 and the needle position detector 15 (Step S66), and when it reaches the set main shaft angle, the motor 1 is stopped (Step S67), and the thread cutting solenoid 56 is turned off (Step S68). Accordingly, the second cutting control is ended.
  • the set main shaft angle for example, 53 degrees
  • a cam mechanism structured so that the roller 52 moves along the direction of the rotation shaft of the thread cutting cam 51 and engages with the cam groove 51a is adopted, however, for example, a cam mechanism structured so that, for example, a section as a part of the cam groove opens toward the outer side in the rotation radial direction and the roller moves toward the inner side in the rotation radial direction from the opening and engages with the cam groove can also be adopted.
  • a table determining proper thread cutting set rotation speeds V1 to V12 with respect to the respective values of the lower stop angle ⁇ 1 to be detected is prepared in advance (refer to Fig. 13 ), and by referring to this table, the thread cutting rotation speed v1 is determined.
  • a thread cutting rotation speed v1 which does not cause delay of completion of the engagement of the roller 52 may be calculated according to a rotation angle from a lower stop angle ⁇ 1 to reach to the cam operation section based on a time necessary to complete the engagement of the roller 52 from the start of driving of the thread cutting solenoid 56 and the lower stop angle ⁇ 1.
  • a solenoid is shown as an example of the thread cutting actuator, however, other driving devices such as an air-driven system or motor can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Claims (2)

  1. Nähmaschine (10), umfassend:
    eine Hauptwelle, welche von einem Motor (1) in Rotation versetzt wird, um eine Nähnadel auf und ab zu bewegen;
    ein Positionsdetektiermittel (14, 15) zum Detektieren eines Rotationswinkels der Hauptwelle als ein Hauptwellenwinkel;
    einen Fadenschneidmechanismus (30) mit einem beweglichen Messer (31), welches ausgebildet ist, einen Nähfaden zu fangen und den Nähfaden zu schneiden;
    einen Fadenschneid-Kurvenkörper (51) mit einer Kurvenkörpernut (51a), welche entlang einer Umfangsrichtung des Fadenschneid-Kurvenkörpers (51) gebildet ist und synchron mit der Rotation der Hauptwelle rotiert;
    einen Kurvenkörperfolger (52), welcher ausgebildet ist, mit der Kurvenkörpernut (51a) des Fadenschneid-Kurvenkörpers (51) in Eingriff und außer Eingriff zu treten und unter Eingriff mit der Kurvenkörpernut (51a) das bewegliche Messer (31) gemäß der Kurvenkörpernut (51a) zu bewegen;
    einen Fadenschneidaktuator (56), welcher den Kurvenkörperfolger (52) zwischen einer Eingriffsposition und einer Außereingriffsposition bezüglich des Fadenschneid-Kurvenkörpers (51) schaltet; und
    ein Steuermittel (100) zum Steuern des Fadenschneidaktuators (56) und des Motors (1),
    wobei das Steuermittel (100) ein Operations-Timing-Bestimmungsmittel umfasst zum Bestimmen eines Operationsstart-Timing des Fadenschneidaktuators (56) oder des Motors (1) basierend auf mindestens einer der Größen, welche sind eine Rotationsgeschwindigkeit (v1, v2) des Motors (1) für eine Fadenschneidoperation und ein Hauptwellen-Stoppwinkel (θ1), bei welchem die Hauptwelle unmittelbar vor der Fadenschneidoperation gestoppt hat, dadurch gekennzeichnet, dass
    das Steuermittel (100) eine Wartezeit (T) von dem Operationsstart des Fadenschneidaktuators (56) bis zu dem Operationsstart des Motors (1) basierend auf einer der Größen, welche sind die Rotationsgeschwindigkeit (v1) des Motors (1) für die Fadenschneidoperation und der Hauptwellen-Stoppwinkel (θ1), einstellt.
  2. Nähmaschine (10) nach Anspruch 1, wobei das Steuermittel (100) die Fadenschneidoperation in Verbindung mit einer Rückwärts-Pedaltret-Operation eines Pedals ausgehend von einer neutralen Stellung durchführt.
EP15193321.5A 2009-10-13 2010-10-12 Nähmaschine Active EP3006615B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009236493A JP5555470B2 (ja) 2009-10-13 2009-10-13 ミシン
JP2009236454A JP2011083320A (ja) 2009-10-13 2009-10-13 ミシン
EP10187338.8A EP2312033B1 (de) 2009-10-13 2010-10-12 Nähmaschine

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP10187338.8A Division EP2312033B1 (de) 2009-10-13 2010-10-12 Nähmaschine
EP10187338.8A Division-Into EP2312033B1 (de) 2009-10-13 2010-10-12 Nähmaschine

Publications (2)

Publication Number Publication Date
EP3006615A1 EP3006615A1 (de) 2016-04-13
EP3006615B1 true EP3006615B1 (de) 2017-08-16

Family

ID=43570576

Family Applications (2)

Application Number Title Priority Date Filing Date
EP10187338.8A Active EP2312033B1 (de) 2009-10-13 2010-10-12 Nähmaschine
EP15193321.5A Active EP3006615B1 (de) 2009-10-13 2010-10-12 Nähmaschine

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP10187338.8A Active EP2312033B1 (de) 2009-10-13 2010-10-12 Nähmaschine

Country Status (2)

Country Link
EP (2) EP2312033B1 (de)
CN (1) CN102041647B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITPD20120083A1 (it) * 2012-03-19 2013-09-20 Sire Srl Macchina per cucire con dispositivi di controllo del funzionamento
JP6108689B2 (ja) * 2012-06-05 2017-04-05 Juki株式会社 ミシン

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4421046A (en) * 1980-02-21 1983-12-20 Mitsubishi Denki Kabushiki Kaisha Thread cutter assembly in sewing machine
US5372079A (en) * 1993-08-11 1994-12-13 The Singer Company N.V. Thread trimming device for a sewing machine
JPH08141265A (ja) * 1994-11-25 1996-06-04 Brother Ind Ltd ミシンの操作装置
US5967069A (en) * 1997-09-08 1999-10-19 Rodriguez; Felipe Sewing machine cutting system having microprocessor controlled cutting blade
JP2000317182A (ja) * 1999-05-07 2000-11-21 Juki Corp 糸切装置付ミシン
JP4782295B2 (ja) * 2000-04-12 2011-09-28 Ｊｕｋｉ株式会社 サイクルミシン
JP4108991B2 (ja) * 2002-02-20 2008-06-25 Ｊｕｋｉ株式会社 ミシン
JP3973484B2 (ja) * 2002-05-14 2007-09-12 Ｊｕｋｉ株式会社 糸切り装置付ミシン
JP2007181609A (ja) 2006-01-10 2007-07-19 Juki Corp ミシン
JP2008295946A (ja) * 2007-06-04 2008-12-11 Juki Corp ミシン

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP2312033A3 (de) 2015-05-06
CN102041647B (zh) 2014-04-09
CN102041647A (zh) 2011-05-04
EP2312033A2 (de) 2011-04-20
EP2312033B1 (de) 2016-08-24
EP3006615A1 (de) 2016-04-13

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