DE1816353A1 - Sewing machine - Google Patents

Description

Kiss, the 18th December 1968

PA TBNUNWALIi ₍ ^ ₉₀₁ / f _r / _th )

Dr. Andrejowski ' '

Dr.-Ing. Honke 1816353

Essen, Kettwiger Str. 36

<At the main railway station lidiiborg)
Telephone 225802/03

Patent registration of the company
De Jong & De Vlieger
Machinehandel NV
Olmenlaan 3,
Zwane nburg / HaIfweg
Holland -

Sewing machine.

The subject of the invention is a sewing machine with a main clutch which can be operated forwards by depressing a pedal and a rotary switch needle setting assembly such as one connected to the main machine shaft Electromagnetic clutch and braking device controlling control roller, by means of which the main shaft via a reduction gear with reduced The speed can be driven or locked in the desired needle position by returning the pedal to the rest position The machine shaft can be driven at reduced speed via the electrical coupling and then switched on

909833/0934

The brake can be locked in the lowest position and when the pedal is then operated in the opposite direction backwards, the electromagnetic one The clutch can be switched on again, thereby making the needle fit reduced speed can be brought to its maximum position until the brake is switched on, with an oarn cutter can be actuated during this needle movement.

If the thread is to be cut in such sewing machines, the pedal must first be released from its front

W. Be brought back to the tilted position so that the

Machine stopped with the needle in the lowest position whereupon the pedal moves in the opposite direction must be pushed back to bring the needle to the maximum position, whereby the oarn cutter is activated, as soon as the needle has moved out of the machine's needle plate. With the previously common sewing machines In this way, the yarn cutter is generally controlled mechanically or electro-pneumatically by means of a special pedal-operated cam disk or a microswitch. As a result, two special foot movements have to be carried out if one wants to cut the yarn, i.e. one has to

α first release the pedal so that it returns to the rest position.

returns. Then you have to wait so long for the machine stand still and finally press the pedal backwards. This naturally greatly reduces the work performance of the operator of the machine Needle setting speed on these machines relatively low, i.e. it operates around 15-18 revolutions per minute, because of the pedal-controlled actuation arrangements for the thread cutter generally no · higher turn » allow payment.

90§ä337Ö $ M

^iÄ "ÖRÜ« iÄi INSPECTED

This is where the invention aims to remedy the situation, namely through an electrical control system for such a machine which has a faster needle setting and a faster Allows yarn cutting, which can improve the performance of the machine.In particular, the operator should if you want to cut the yarn, you have the option of using the control pedal in a single continuous Moving through from its foremost tilted position to the rearmost tilted position.

For this purpose, the invention proposes the electrical control of a sewing machine of the type mentioned at the beginning to train in such a way that an electrical control circuit is provided and one in the foremost pedal position over a pedal contact excitable first control relay for closing a first excitation circuit for the electromagnetic Includes clutch and a second control relay, this coil with a closed in the rearmost pedal position second pedal contact, one normally closed contact of the first control relay and one in the top one Made1lage open contact of the cage setting in series is, by energizing this second control relay a second excitation circuit and the electromagnetic clutch can be closed, via which the needle after it has been reached from the lowest point to the highest point and there is lockable, the thread during this movement through another contact of the needle setting electrically controlled yarn cutter can be cut.

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The yarn cutter is preferably pneumatically driven via electromagnetically actuated valves the valves are controlled by the additional contact of the needle setting. According to another specialty of the

Irfimäu & g wt is the first · control relay «» Intη trütchaltkontakt sum abwtohaslndtn linsohalttn «er errors of the tlsktro- ■ agnetiecjhÄn coupling to« «tltktroeagnttisohen Br ·» ·· on, trelhts * «attrcontact * jtschalttt is, weaves through dt * the latter Um aha Ifckonfcak t btl excitement of the second Ittutrrtlai · tin mwttttr SEri ^ tgtrkrtC · 4tr tltktroeafftttlicitft XuppliÄ «ft- * concluded Kiri. SchiitlUah is vorftethtft, «al« at zwtitt Sttutrrtlalt aufltrdt «tintη 8ohaltko» takt aufutle * and Ubtr dltttA bti Irrtfuiif «t« Rtlalt tin btl Mrr * lsmm * · ■ 0 * r »- abtohrbart · t »T» in * · «■« »Stronfcrti · dtr« utätilloht Contact dtr ladtl-

'-; ·: ■ 1 ilottr Au »education« dtr thread abgtiohnitttn wtrdtn to3X "needs dlt B" dItnunfepraon in Followdtatta da "Pedal tm dtr vor * r »ttn Titflag · in dit hinteritt Lage zu i * da in dt »comes» in wtlohtm «ie Wadtl ihrt Titfettrrtioht and da« «ritt 3teutrre3.ali is tntrtft because« ώ itt sttutrrtiaig immediately exercises rniaet and «the electronic

/ ieoh «clutch · o long held in IiIt ₄ until in" he higher charge position is also switched off and the second attutrrtlai "is switched off and" the electromagnetic table brtmst is kept. The possibility _{# of} tilting the Sttuerptdal in a single movement from vorat to the back, naturally gives »* · tint btdeuttndt workload. Apart from that, you do not have to go to the mungeptreon as well, because you can leave your foot on the pedal while you are not constantly letting go of the pedal. The titktrieft control "er pneumatic actuation" it oarns shut-off by "le Made le instllung accelerated ftmtr""sttn BIneo-hold an" activity, eoda £ the speed "er" also for "le load! Setting to, for example, 220-300 U / Min, can be increased «

909833/0934

BATH

A more detailed explanation of the invention results from the following description based on the enclosed Drawing "which" in a sohematlsche representation of the electrical control circuit of the mower according to the invention represents «In this drawing are for reasons for the sake of clarity, only those mechanical parts of the sewing machine which are necessary for an understanding of the invention are shown are absolutely necessary.

Sewing machine itself can be designed in the usual way and has an electric drive motor 1 with a motor shaft 2, - a Masohinenwelle 3 for driving the moving machine parts with the needle, not shown, in its upward and downward movement. The motor shaft 2 can be coupled to the machine shaft 3 via a coupling 4 and can be actuated via a pedal 5, which the operator can tilt forwards and backwards from its central position shown. The clutch can be designed in a manner known per se and has, as shown, a friction disc 6 fixedly connected to the motor shaft 2, a brake disc 7 fixedly connected to one side of a sonic wheel 8 freely rotatably seated on an intermediate shaft 9 and a spring-loaded clutch disc 10, which sits non-rotatably but axially displaceably on the shaft 9, about per se; known and therefore π loht organs shown is * sgung at a Kippbet the pedal counterclockwise from its center lay ahead aim clutch plate 10 to the left geschob®η and passes therethrough in! attacked with Bbibscheibe 6 whereby DL® motor shaft 2 Bit € he Is connected between shaft 9, wähi * © »! in the central position of the pedal 5, as well as, by tilting this pedal clockwise backwards, the clutch disc 10 is against the

833/0934

BATH

Friction disc 7 sets and thereby the worm wheel 8 with the Intermediate parts 9 connects · The shaft 9 is with the Machine parts 3 via any suitable coupling elements such as a belt drive 11 connected.

Kin electromagnetic clutch and brake unit 12 sits on a shaft 13 with a screw 14, which with meshes with the worm wheel θ. This unit 12 has a ^ magnetic coupling member 15 »which can be freely rotated the shaft 13 sits and a clutch winding l6 to his Excitation carries · The unit 12 also has a magnetic Bremaorgan 17, which is on a stationary Part of the masonry attached 1st and a brake roll l3 su his excitement carries «On the shaft 13 sits also not rotatable, but axially displaceable, a clutch disc 19 made of magnetic material, so that when energized of the clutch winding l6 this disk against the additional plate pulled on the organ 15 and thereby this organ is coupled old to the shaft 13, while the brake winding is energized 18 this clutch disc 19 is pulled against the stationary part 17 and thereby the shaft 13 stops. The magnetic coupling element 15 also carries a belt pulley 20, which via a suitable belt drive 21 connected to a pulley 22 on the motor shaft 2 1st. As a result, the magnetic coupling member 15 is directly and continuously from the motor. 1 driven

When the pedal 5 is now depressed forward and thereby the clutch disc 10 is pressed against the friction disc 6, the machine shaft 3 is driven by the motor 1 via the clutch 4 at full speed. As soon as however the pedal 5 is in its central position or in the rearmost position in which the clutch disc 10 is against

909833/0934

BATH ORIGINAL

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* er mt% "- t3 fife © * 4" n Schneckentrieb 3 "14 v" rbun * tn, whereby at ^ v ^^ Uii "<i ^ Küpplungewiokliais l6 44 · Hasohinen-3" it ^^. teiertts- M ^ hxehl, d, h _e aleo "It Ur" ** · 1-ar ^ vrlti "^ and in the event of an err ^ gung 4tr Kupp" immediately mlig * brea "t; ψ & «agehtlten wtri. - '.-.' -Disa «8 ¥ orb« K -: ^^ al ^ ine M ^ lftb * af »t« m »it £ βω Xuppluti« · - ~ - -

utid

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^ «Raorg * Biggie l» t «ter« a 'erfi & r & ok »A mme over a hawk:, ■ ?,'

Zwieohenmum swieoheft <em a » for you to be in contact with one another ':', iet imi wJLnkeI »äSig iet iet.

The contact rings and the contact rings are arranged in such a way that the brush 3 extends the ring 39 at an angle to the control wall ₃ which deepens the position of the needle and removes it Bllrete ^ 2 theiri "Rirj 28 in the rolling position of the control wheel 24 V3rlfi" s <, _f ^ icloho 4 corresponds to the uppermost position. The buret 30 touches the short hanging 26 during 4

909833/0934

OADORfGtNAL

The control circuit is supplied by a suitable power source 25 such as the normal power line via a Transformer 34 with a secondary voltage of 30 V and « a rectifier 35 is fed. The P Iu ekle mn · «read β The rectifier is directly connected to the contact brush 31 and the material position 23.

With the terminals on the rectifier 35 let the coil 37 of a first control relay 36 connected, we loht in series with a pedal contact 38 "the in" position is in the foremost position “Pedals are closed and in the middle and back position pedal is open * This relay has a normally open Sehaltkontakt 39, a normally closed closed switching contact 40 and a changeover contact 41. When the pedal contact 38 is closed and the Helaiespule 37 is excited, the contact 39 leaves a holding circuit for the relay 36 from the positive terminal of the rectifier 35 across the contact brush 31, the control roller 24, the contact brush 33, the relay contact 39, the relay coil 37 to the socket terminal of the rectifier.

A second control relay 42 has a relay coil 43, one end of which to the negative terminal of the rectifier rs 35 and the other end via the normally closed switching contact 40 of the relay 36, a second pedal holder 44, which is closed in the rearmost position of the pedal 5, the contact brush 32, the control roller 24 and the contact brush 31 are connected to the positive terminal of the rectifier 35 is.

If both relay coils 43 and 37 are de-energized, there is a circuit from the positive terminal of the rectifier 35 via one Switching contact 45 "es relay 43," a changeover contact 41 "es

909833/0934 ßAD OftlQINAL

Relay 36 and the brake winding l8 of the clutch and brake unit 12 closed to the negative terminal of the rectifier. When relay 36 is energized, a similar circuit appears closed, which, however, now runs via the changeover contact to the clutch winding l6 of the unit 12. if the relay 42 is energized, a circuit from the positive terminal of the rectifier via the changeover contact 45 is direct to the clutch winding l6 closed.

The control relay 42 also has a normally open switching contact 46, which via the rectifier with a relay coil 48 of a third control relay 47 and the contact brush 30, which is connected to the contact ring 26 the control roller 24 cooperates, lies in series. This control relay 47 has a changeover contact 49, which in the rest position, i.e. in the position shown in the figure, the field winding 51 of an electromagnetically controlled Valve 50 connects to the rectifier 35 and at Excitation of the relay 47 the field winding 53 of the same electromagnetically controlled valve 52 with the rectifier connects. The valves 50 and 52 can in itself in a known manner, for example in the form known under the trade name "ElectroJet". They are on their inlet side with a common air inlet duct 54 connected, which to a not shown Compressed air place leads. The outlets of these valves 5O and 52 are respectively via lines 55. 56 with a cylinder 57 connected, the piston 58 of which is connected to a yarn cutter via its piston rod 59. Yarn cutter are generally known in sewing machine construction and for this reason are not shown here, as they do not form part of the invention form. Suffice it to say that when the winding 51 is energized as shown in the drawing, the

909833/0934

Valve 50 is opened, reducing the pressure on the right Side of the piston 58 holds the thread cutter in Buhelage. When the contact 49 is switched and thereby the winding 51 is turned off and the winding 53 is turned on, that becomes Valve 50 closed and valve 52 opened, so that the piston 58 exerts its working stroke and the yarn cutter actuated. When switching the switch 49 returns the piston 58 then returns to its rest position.

The above-described control circuit for the Madel setting and the thread cutter works as follows

The motor 1 is switched on, so that when depressed of the pedal 5, the clutch disc 10 is pressed forward against the friction disc 6 and thereby the main shaft of the machine 3 is driven at normal operating speed of, for example, 500 to 6000 rpm. By pressing the Pedals 5, the pedal contact 38 is closed, so that Control relay 36 is energized and the changeover contact 41 the Circuit of the brake winding 18 of the clutch and brake unit 12 interrupts and the circuit of the clutch winding 16 of this unit closes. The excitement of Clutch winding l6 presses clutch disc 19 against rotating part 15 * which thereby drives shaft 13 drives and over the worm 14 the Schneekenrad 8 · Da -; * however, this worm wheel is free on the intermediate shaft 9 can turn, there is no result at this moment Effect. q ^ i

If the operator now lets go of the pedal 5 and. This as a result returns to the rest position * remains the heli The contact brushes land via its closed holding contact 39 31 and 33 of the control roller 24 excited as long as the The mower's needle has not yet reached its lowest position

909833/0 9 34

Has. With the return of "es Pedals 5 in rest" the Clutch disk IO pulled off the friction disk 6 and puts the worm wheel β θ against the friction disk 7, whereby this is coupled to the Zwlsohenwelle 9. This wave and consequently also the machines * · 11 · 3 is as a result of the worm drive U, 8 at reduced speed according to the Made Ie Inste llung of for example 300 rpm, set in rotation. If dl * needle reaches its lowest position, leaves the contact brush 33 the contact ring 29, whereby the holding circuit of the relay 36 is interrupted and this relay is de-energized. Sohaltkontakt 41 interrupts the circuit of the Clutch winding 16 and closes the circuit of the brake winding 18, so that the machine is stopped immediately, when the needle is in its lowest position «

If the operator now pushes the pedal 5 backwards depressed, the pedal contact 44 is closed. There" through becomes the circuit of winding 43 of the control relay 42 via the contact burets 31 and 32 of the control roller 24 and the now closed contact 40 of the de-energized Relay 36 closed * whereby relay 42 is energized and its contact 45 switches over in such a way that the circuit of the Bremswioklung 18 is interrupted and the circuit the clutch coil 16 is closed. The clutch disk 19 is thereby released again by the brake element 17 and drawn towards the coupling member 15, whereby the machine Wt 11 · 3 again with the reduced needle setting speed is driven and the girls from their depths to hers Highest position moves. As soon as the quay reaches this maximum position, the contact brush 32 leaves the contact ring 28 the control roller 24 and interrupts the circuit the relay winding 43, so that the relay contact 45 again

909833/0934

BATH ORIGINAL

is switched and the circuit of the clutch winding 16 opens and the circuit of the brake winding 18 closes. This means that the machine is in the highest position Sewing needle stopped immediately.

The excitation of the control relay 42 also results in the closure of the contact 46, whereby the circuit for the winding 48 of the relay 47 is prepared. While moving the barring needle from its lowest to its highest position puts the contact brush 30 against the contact ring 26 of the Control roller 24 and thereby energizes the relay 47 briefly, so that its changeover contact 49 is actuated. This creates the previously closed circuit of the control winding 51 the electromagnetic valve 50 is interrupted and the circuit of the control winding 53 of the valve 52 is closed, so that the thread cutter is operated in the manner described above. When the control relay 47 is de-energized again, the winding 51 becomes again through its changeover contact 49 errigt so that the thread cutter returns to its rest position.

Since the control circuit described above, it is the operator possible, the pedal 5 in a single continuous movement from the foremost lowest position to the middle position to move to the rearmost position, i.e. the yarn cutter position. In this case, the control relay 36 is energized first and, as soon as the needle has reached its lowest position and this de-energizes this relay, the control relay 42 excited. As a result, the clutch winding l6 remains energized and without interruption, causing the needle to move in a continuous movement from its lowest position to the highest position in which the machine can move is stopped.

909833 / 093A

The electrical control via the needle setting device 23 of the solenoid operated valves 50 and 52 for the pneumatic actuation of the thread cutter allows this mechanism to work very quickly and precisely. For this reason, a relatively high Reach the needle setting speed for the machine shaft 3

Claims 1

909833/0934

Claims (1)

Expectations 1. sewing machine with pedal by pressing the bodice Main clutch that can be operated at the front and a Madeleinstelleinrichtung with rotary switch such as one connected to the Masohinen main shaft, electrically controlling an electromagnetic auxiliary clutch and braking device Control roller, by means of which the main shaft can be driven BEZW via a reduction gear at reduced speed. lockable in the desired needle position "* can be driven by the machine shaft with reduced speed and by switching on the Brake can be locked in the lowest position of the Madel and when the pedal is then operated in the opposite direction backwards, the electromagnetic one The clutch can be switched on again and thereby the needle at reduced speed until the brake is switched on their highest position can be brought, with a yarn cutter can be actuated during this needle movement, characterized in that an electrical control circuit is provided and an in the foremost pedal position via a Pedal contact (38) comprises excitable first control relay (36) for closing a first excitation circuit for the electromagnetic clutch (15, 16) and a second control relay (42), the coil (43) of which with a second pedal contact (44) closed in the rearmost pedal position, a normally closed contact (40) of the first control relay (36) and open in the uppermost needle position Contact (32) of the needle setting (23) is in series, with this second control relay being energized second excitation circuit for the electromagnetic clutch can be closed, via which the needle after reaching the Lowest level can be brought to its highest level and there 9098 3 3/0934 lockable and the yarn through during this movement The yarn cutter, electrically controlled via a further contact (30) of the needle setting (23), can be separated is. . 2 sewing machine according to claim 1, characterized in that that the thread cutter operated electromagnetically Valves (50, 51 and 52, 53) is pneumatically driven and the valves from the additional contact (30) of the Needle setting (23) is controlled. 3. Sewing machine according to claim 1 or 2, characterized in that the first control relay (3β) has a changeover contact (4l) for alternating activation of the excitation circuits of the electromagnetic clutch (15, l6) respectively. having the electromagnetic brake (17, 18) and that (45) of the second control relay (42) is connected in series with a changeover, wherein by the If-mentioned change-over (45) -r-nt at · energization of the second control relay, the second Eipeegerkreis ά £?> electromagnetic clutch can be closed. 4. Sewing machine according to claim 1, 2 or 3 # characterized that the second control relay (42) also e / ^ a Has switching contact (46) and via this when energized of the relay a third relay (47) which actuates the yarn cutter when it is energized can be switched on, in which circle the additional contact (30) of the needle setting (23) lies. PAe Dr Andrejewski, Dr Honke, 909833/0934 BAD OBIGiNAt Blank page