From the library of: Superior Sewing Machine & Supply LLC
Страница 1: ...I L MODEL MB 372 HIGH SPEED SINGLE THREAD CHAINSTITCH BUTTON SEWING MACHINE Instruction Book TOKYO JUKI INDUSTRIAL CO LTD From the library of Superior Sewing Machine Supply LLC ...
Страница 2: ... 14 17 CHANGING THE POSITION OF THE BUTTON TRAY 15 18 STITCH SELECTING 15 19 HEIGHT OF BUTTON CLAMP 17 20 ADJUSTING THE BUTTON CLAMP PRESSURE 17 21 ADJUSTING THE BUTTON CLAMP STOP LEVER 18 22 ADJUSTING FOR 2 HOLES AND 4 HOLES 18 23 CHANGING THE BUTTON HOLDING CLAMP AND ADJUSTING ITS HEIGHT 19 24 CAUSES OF MALFUNCTIONS AND REPAIRING 21 25 ATTACHMENTS TO MB 372 BUTTON ATTACHING MACHINE 21 i How to i...
Страница 3: ...nap fasteners shank buttons and metal shank buttons This is an ideal machine to attach these buttons on all knit goods men s shirts work uniforms ladies suits and men s suits This machine is equipped with 8 stitches 16 stitches and 32 stitches and these stitches are interchangeable without changing the stop motion From the library of Superior Sewing Machine Supply LLC ...
Страница 4: ...ing oil 2 hole button 4 hola button MB 372 Single thread chainstitch button sewing Knit goods shirts working wear etc Max 1500s p m 1 Lengthwise feed 0 2 hole button 2 Lengthwise crosswise feed 4 hole button 3 By attachment Snap Shank Metal shank or Wrapped round 48 6 m m 1 7 8 TQx7 175x7 or TQxl 175x1 14 18 8 16 32 Gam not to be changed 6 12 24 Cam to be changed Crosswise feed 2 5 6 5 m m 3 32 l ...
Страница 5: ...op motion disc applying pressure lever Needle driving pulley Stop motion disc Ball joint eccentric Loopershaft tube Crosswise feed graduated plate Loop positioning finger cam rear Loop positioning finger cam front Looper Button clamp lever jaw Feed plate Needle plate Needle Button clamp lifting rod 0 L shaped button clamp lifting rod Tension disc No 3 Thread guide No 3 Needle bar bearing block thr...
Страница 6: ...this machine is 1 500s p m but for the first month operate the machine at the speed of 1 200 1 300 s p m For the number of revolutions please refer to the Chapter on Motor pulley and Belt The rotational direction of the machine is shown by the arrow in It oia ireotiM 5 LUBRICATION Refer to Fig 1 2 3 and 4 In order to ensure a long life of the machine and to run it in a smooth running condition the...
Страница 7: ...e times check and see if the oil comes up to the surface of the felt inside the machine sub base and if not fill up with oil 6 MOTOR PULLEY AND BELT For connecting directly to the power source use an electric motor of 3 phase 1 4 HP The relation between the number of rotation of the machine with the effective diameter of the motor pulley is shown in the table below Effective diameter of the motor ...
Страница 8: ...Qx 1 needle is shorther than TQx7 so when attaching buttons take in the height of the button thickness of the sewing material into consideration and when the needle comes down to the lowest point be careful to see that the shank of the needle does not hit the button itself 8 INSERTING THE NEEDLE Fig 5 To insert the needle loosen the needle clamping screw and insert the needle into the needle bar a...
Страница 9: ... guide No 2 6 upper eyelet of ace plate thread guide No 3 2 needle bar bear ing block and thread guide thread tension disc No 3 thread guide 9 tension disc No 3 to the needle eye from front toward rear and draw the thread out about 6 7 m m about 1 4 To draw out the thread push the nipper releasing plunger knurled nut the nipper will be released and the thread can be drawn out ThreadX int u IJ From...
Страница 10: ...djust the tensions of these discs turn the adjusting screw of the disc toward the arrow direction to make the tension stronger but the tension required will vary in relation to the types of thread materials and thickness of buttons used 11 FUNCTIONS OF THE THREAD PULL OFF LEVER Fig 9 0 The thread pull off lever Fig 6 controls the amount of thread which is pulled through the tensions at the end of ...
Страница 11: ... arrow A move it to left but if the tail appears toward the arrow B Fig 10 move it toward right so that the tail of the thread will not come out 12 THE THREAD NIPPER Fig 11 o oo B Fig 10 o o o 0 8 1 2 J i a 6 The function of the thread nipper is to prevent the thread from drawing out when at the conclusion of a sewing cycle the button clamp ing device goes up and cuts the thread The nipper will pi...
Страница 12: ... the upper pair of timing lines when using short needles TQ Xl for using long needles TQ x7 use the lower pair of timing lines Step on the pedal fully to release the stop motion trip lever and in that position rotate the motor pulley toward the operating direction with your right hand Fig 2 and when the needle bar has reached the lowest position the upper line of the each pair of liming lines Fig ...
Страница 13: ...e plate adjust so that the bearing block and thread guide comes to the center of the machine arm front cover slot Fig 7 and then tighten the set screw iii Timing the needle and the looper As per Chapter 13 the upper liming line of the pair of timing lines became even with the lower edge of the needle bar lower bushing at the lowest point of the needle bar so rotate the pulley toward the operating ...
Страница 14: ...e looper and the other is to match the timing of the looper positioning finger with the loop positioning finger cam front The latter should be applied when disassembling the machine and for any other purposes do not move the machine For adjusting the looper refer to the chapter on Timing the needle and From the library of Superior Sewing Machine Supply LLC ...
Страница 15: ...needle and the loop positioning finger edge as shown in Fig 16 ii Timing the loop positioning finger cam front Fig 15 In order to time the loop positioning finger cam front match the carved line of the loop positioning finger cam rear I with the cam and looper sleeve D carved line and also with the carved line of the loop positioning finger cam front all on a straight line and then tighten screws ...
Страница 16: ...ful The standard motion is as shown in Fig 17 to rotate the needle driving pulley toward the arrow direction as you pull the thread and the tension disc No 2 will float up and the thread will be slipped out quickly At this instant the height from the needle bar upper bushing surface to the top edge of the needle bar is 54 57 m m 2 7 64 2 3 16 When defective signs as shown below occur too frequentl...
Страница 17: ...i Too frequent thread breakage Rotate tension post no 2 toward the arrow direction 17 CHANGING THE POSITION OF BUTTON TRAY Normally the button tray is attached to the right side of the machine But if this position is inconvenient depending upon the nature of operation loosen the button tray leg set screw and insert the tray into the hole which is on the left side of the front part of the table 18 ...
Страница 18: ... and becomes an 8 stitch selection ii 16 slitch selecting Fig 19 Fig 20 With the 8 slilch selected position move the stop motion cam knob 2 The stop motion cam 0 at the position shown in Fig 19 will rotate one complete revolution at one sewing cycle and becomes a 16 stitch selecting iii 32 stitch selecting Fig 20 With the 16 stitch selected position loosen screw a push down the stitch selecting le...
Страница 19: ...late at the stop motion position is 12m m 15 32 To adjust to this distance loosen the set screw g of the button clamp lifting rod and move it up or down 20 ADJUSTING THE BUTTON CLAMP PRESSURE Fig 21 To adjust the button clamp pressure rotate the button clamp pres sure adjusting spring nut D so that the clearance between the bottom surface of the button clamp pressure adjusting spring nut and the s...
Страница 20: ...clamp screw 1 22 ADJUSTING FOR 2 HOLES AND 4 HOLES First measure the distance between the button holes in mm or inches In the case of 4 button holes as all standard button holes have holes at the corners of the 4 hole square match one side as the length wise scale and the other as the crosswise scale i Lengthwise scale Fig 23 By pushing down the handle and indicator spring Fig 23 D set the indicat...
Страница 21: ...ating the pulley make the needle fall in the center of the hole 23 CHANGING THE BUTTON HOLDING CLAMP AND ADJUSTING ITS HEIGHT Fig 25 26 With the Model MB 372 Machine when the shank button clamp attachment is to be used or when the clamping of buttons is done by the pedal the clamp holding device is attached For this purpose loosen the engaging button clamp lifting link lever hinge screw T move it ...
Страница 22: ... changing to automatic system from pedal system make absolutely certain that the button clamp lifting lever stop J is pulled way up from the contacting surface of the machine Fig 25 When converting to automatic system open this space wide Fig 26 20 From the library of Superior Sewing Machine Supply LLC ...
Страница 23: ... float timing of tension disc no 2 Adjust the tension of tension disc No 2 Adjust with the button clamp ing lever jaw holder Adjust the button clamping pressure First stitching thread comes out on top of button excessively Inadequate adjustment of tension lever Adjust the nipper bar block rear Thread cutting bad at stop motion Bad timing of tension disc No 2 Needle hitting the button hole Inadequa...
Страница 24: ...remove the button clamp components 1 Fig 27 also the button clamp work support plate g and in their place install the snap fastener attachment Then after setting the cross wise feed and the length wise feed at 4 m m 5 32 each install the button clamp work supportplate Fig 28 in such a way for the needle to fall evenly on the four cornersof the square hole Next install the snap fastener clamp Fig 2...
Страница 25: ... install the wrapped around button clamp Fig 30 31 32 A Sewing flow of work In sewing in the wrapped around button there are 2 stages of work flow the so called button attaching process and the wrapping around process The button attaching process is a preliminary process before the wrapping around process and the distance between the button and the cloth is lengthened beforehand and the button is ...
Страница 26: ...if the needle falls into the button hole it will not touch the button clamp snaking foot J b Attaching the wrapped around attachment After the button attaching process is conpleted remove the button clamp component and button clamp work support plate D Fig 27 and in the place of support plate 2 install the wrapped around attach ment Fig 31 This attachment should be adjusted by looseniug the button...
Страница 27: ...he same position as in the case of 2 hole buttons iii How to install the shank button clamp attachment A Remove the button clamp component Fig 27 i and the button clamp work support plate D and install the shank button clamp bracket Fig 33 D Adjust the button clamp bracket so that the needle will fall in the middle of the needle groove and tighten the screw d The shank button adapter is a part of ...
Страница 28: ...drop the needle to see that it falls equi distant right and left with the shank of the shank button as the central pivot When this is verified tighten the button holder set screw Also make sure that there is just sufficient space of about 0 5 1 0mm between the button clamp work support plate left end surface and the left end surface of the adapter 8 as to prevent the sewing cloth from pushing out ...
Страница 29: ...ssible To maintain a stable stitching condition make doubly sure that the needle is not contacting the needle groove of the adapter or the button clamp work support plate then start the button attaching task The holding pressure of the button holding clamp Fig 35 should be sufficiently strong enough so that the button does not move during the stitching operation iv How to install the metal shank b...
Страница 30: ...ld be better at this time to raise up the right shoulder of the button guard and set the foot of the metal button solely by the left shoulder Next loosen the button clamp bracket set screw and adjust so that the circular groove surface of the lower part of the adapter exactly meets the grooved surface of the work support plate After adjusting drop the needle to see that needle falls evenly to righ...
Страница 31: ... Cautions on sewing operation a In order to attach the metal shank buttons securely try to make the crosswise feed as little as possible b To maintain a stable stitching condition be sure to verify that the needle is not touching cither the adapter or the needle groove of the work support plate or the base of the metal button From the library of Superior Sewing Machine Supply LLC ...
Страница 32: ...0mm 15 32 25 32 Distance between outer diameter of buttons 4 6mm 5 32 1 4 Material presser lower plate for medium size buttons D 2529 372 B00 Note All other specifications are same as SUBCLASS 1 SUBCLASS 3 FOR LARGE SIZE BUTTONS Diameter of button 15 25mm 9 16 31 32 Distance between outer circumserence of buttons 5 7 5mm 3 16 9 32 Button clamp lever jaw right for large size buttons D 2555 372 C00 ...
Страница 33: ...1 256 10 mm 3 8 plus 1 64 11 mm 7 16 less 1 128 12 mm 15 32 plus 1 256 13 mm 33 64 less 1 256 14 mm 35 64 plus 3 640 15 mm 9 16 plus 3 128 16 mm 5 8 plus 3 640 17 mm 43 64 less 1 256 18 mm 11 16 plus 1 64 19 mm 3 4 plus 3 128 20 mm 25 32 Inch to Milli Meter 1 25 4 m n 1 2 12 7 mm 1 4 6 35 mm 3 4 19 05 mm 1 8 3 175 mm 3 8 9 525 mm 5 8 15 875mm 7 8 22 225mm 1 16 1 5785mm 3 16 4 7625mm 5 16 7 9375mm ...
