US2062223A

US2062223A - Device for limiting the movements of thread guide bars

Info

Publication number: US2062223A
Application number: US50943A
Authority: US
Inventors: Heinitz Woldemar
Original assignee: Schubert und Salzer Maschinenfabrik AG
Current assignee: Rieter Ingolstadt Spinnereimaschinenbau AG
Priority date: 1934-11-23
Filing date: 1935-11-21
Publication date: 1936-11-24
Anticipated expiration: 1953-11-24

Description

w. HEINITZ 2,062,223

DEVICE FOR LIMiTING THE MOVEMENTS- OF THREAD GUIDE BARS Nov. 24; 1936.

Filed Nov. 21, 1935 2 Sheets-Sheet l [kl 6w 60/: WULDEMA R H El NITZ 51/ b Maw ATTORNEV W. HElNlTZ Nov. 24, 1936.

DEVICE FOR LIMITING THHMOVEMENTS OF THREAD GUIDE BARS 2 Sheets-Sheet 2 Filed NOV. 21, 1935 WOLDEMAR HEINI-TZ By a W ATTORNEY Patented Nov. 24, 1936 UNITED STATES PATENT OFFICE DEVICE FOR LTMITING THE MOVEMENTS 0F THREAD GUIDE BARS Application November 21, 1935, Serial No. 50,943

In Germany November 23, 1934 3 Claims. (01. 66-126) The present invention relates to flat knitting machines adapted to produce'plated work and is more particularly concerned with a device for limiting the movements of the thread guide bars.

The devices for limiting the movements of thread guide bars known hitherto are constructed as locking devices, operating on the thread guide bars at the end of their movement, a

that is to say, they are formed as recoil preventing means, acting at the moment the thread guide bars reach the end position. In constructing locking devices of this kind great care must be taken to obtain highest precision, but even then the known locking devices are not absolutely reliable, if high speed platings are carried out, as the locking action is efiected only in the very last moment the thread guide bar strikes the stop, 1. e. in the moment of recoil of said bar.

Compared with all known locking devices of this character, the device according to the present invention has the great advantage, that, with always uniform distance between the thread. guides, exact limitation of. the movement of the thread guide baris obtained under all circumstances with the simplest possible means which simultaneously prevent recoil of the bar.

To obtain this object, locking members, moved in the same direction as the thread guide bars, strike, in the same direction of movement, against lever arms carried by shafts upon which locking arms are mounted adapted to engage behind projections fixed upon the thread guide bars.

These locking members, sliding beneath the lever arms, take up the recoil of the thread guide bars in' the moment the recoil can not longer have any effect upon the thread guide bar.

According to the present invention, a locking member is used for each of the thread guide bars, that is to say, for each of ,the ground thread guide and the plating thread guides a particular locking member is provided. The locking members are arranged in staggered relation to each.

same manner.' Connected to the devicesfor lim-' itinmthe movements of the thread guide bars guides. The block 2 carries the locking members are cam'members efiecting the connection and disconnection of the brakes. The position of these cam members also is altered with the adjustment of the devices for limiting the movements of the thread guide bars. 5

' In the accompanying drawings one embodiment of the invention is shown by way of example.

In these drawings:

Fig. 1 is a perspective view of the device according'to the invention, showing as much of the knitting machine only as is necessary to understand the operation of the new device,

Fig. 2 shows a broken away side elevation and Figs.'3-8 are detail views, showing the individual parts of the,device in different working positions.

For explaining the construction and operation of the device according to the invention a flat knitting machine, having two thread guide bars,

is chosen in the middle part.of which the devices for limiting the movements of the thread guide bars in both directionsof travel are arranged. Of course, if the thread guide bars would strike against stops provided at the ends of the machine, the devices for limiting the movements of said bars and therefore the locking devices would be arranged at both ends of the machine. The devices for limiting the movements of the thread guide bars are, by way of example, shown in connection with plating thread guides. It is, however, understood that the invention may also be used for limiting the movementsof other thread guides.

Mounted upon a bar I, journalled in the frame of the knitting machine, not shown in the drawings, and kinematically connected to the slur bar, also not shown, are two blocks 2'and 2', one for each direction of movement of the thread 40 3. 4-cooperating with -the device for limiting they movements of the thread guide bars 5, 6 in onedirection of their travel and theblock 2' carries the two locking members 3', 4' cooperating with the device for limiting the movements of the two thread guide bars 5, 6, in the other direction of their travel. The portions I, 8'and I, 8' respectively of the

locking members

3, 4 and 3, 4' respectively which in the operative direction are 0 arranged in front are higher than the rear portions 9, III and 9', II! respectively and are connected with the portions I, 8 and I, 8' respectively by inclined surfaces II, I2 and II', I2 respectively. A number of locking members equal 55 to the number of thread guide bars to be locked is always provided.

Shiftably arranged upon a supporting bar I3 fixed in the frame of the machine are the devices I4 and I4 for limiting. the movements of the thread guide bars 5, 6 and a spindle I5 having right-hand and left-hand threadsserves to adjust the devices I4 and I4 which for this purpose are provided with corresponding female threads. 6

As all parts are provided in the same arrangement and operate in the same manner for both directions of movement, the elements shown at the right hand portion of Fig. 1 only are described below, the corresponding elements shown at the left hand portion of Fig. 1 being designated with the same reference numbers provided with an face 8 of the latter.

index.

The device I4 for limiting the movements of the

thread guide bars

5 and 8 in one direction carries bearings iii in which a hollow shaft I I is journalled with slight friction. Fixed upon one end of the hollow shaft I1 is a lever I8 carrying a roller I9 which lies in the path of the locking member 3 and is adapted to slide upon the upper surface I of the latter. At the other end of the hollow shaft II, a locking arm 28 is adjustably fixed by means of a screw 2i. locking arm 28 is adapted to engage behind a projection 22 fixed upon the thread guide bar 5.

A shaft 23 journalled with slight friction in the hollow shaft 'I'I extends at both ends beyond the hollow shaft I'I. Fixed upon one end of the shaft 23 is a lever arm 24 carrying a roller 25. The roller 25 lies in the path of the locking member 4 and is adapted to slide upon the upper sur- Upon the other end of the shaft 23 a locking arm 26 is adjustably fixed by means of a screw 21. The locking arm 26 is adapted to. engage behind a projection 28 fixed upon the thread guide bar 6. Linked to the lever arm I8 is a pawl 29 which lies in the path of a stop 38 fixed to the block 2 carrying the

locking members

3, 4. The pawl 29 is adapted to bear against a projection 3I provided at the free end of the lever arm I8 and serving as a stop. A finger 32 at the device I4 serves to limit the movement of the thread guide bars 5, 6, and against this finger 32 the projections 22 and 28 fixed upon the

bars

5 and 5 respectively are adapted to strike.

Fixed to the device I4 for limiting the movements of the

thread guide bars

5,5 is a bar 33 the bent arm 34 of which is connected to a cam member 35guided in a slot 35 of a bar 31. The bar 31 is arranged between the

thread guide bars

5, 5 and the brake bar 38. By 'means of the cam member 35 the arm 39 connecting the thread guide bar 5 to the brake mechanism, and by means of the cam member 35', the arm 39', connecting the thread guide bar 5 to the brake mechanism, may be lifted. 4

If the thread guide bars 5, 5 and the bar I move in the direction of the arrow :r (Figs. 1 and 3), the projection or stop strikes, at the end of the travel, against the pawl 29 mounted on the lever arm I8. As the pawl 29, bearing against the projection or stop 3|, is prevented from giving way, striking of the stop or projection 38 against the pawl 29 results in swinging the lever arms I8 and 24 into the range of the

locking members

3, 4. Upon further movement of the bar I, the lever arms I8 and 24 are turned by the

locking members

3 and 4 and thereby the shafts I1 and 23, carrying said lever arms I8 and 24 The the upper surfaces I and 8 of the

locking members

3 and 4 respectively, whereby the

thread guide bars

5 and 5 are locked by means of the locking arms 28, 26, thereby preventing any recoil (Fig. 5).

At the end of the movement of the slur bar to which the

locking members

3, 4 are kinematically connected the pawl 29 has been moved out of the range of the stop 30 and drops downwardly (Fig. 6).

During this event of movement, the arm 39 of the brake mechanism is disconnected by the cam member in the moment in which the

locking members

3, 4 come into the range of the lever arms I8, 24.

After reversal of the direction of the movement of the

locking members

3, 4 the arm 39 of the brake mechanism is engaged again, so that the thread guide bar 5 may be shifted in the reverse direction. During the movement of the

thread guide bars

5, 5 in the direction of the arrow 11 (Fig. 6), the stops 22, 28, fixed to said bars, effect rising of the locking arms 20, 26, whereby the shafts I1, 23 are turned, so that the lever arms I8, 24, fixed to the shafts I1, 23 respectively, are moved into the position shown in dashand dotted lines in Fig. 6. The lever arms-I8 and 24 running upon the inclined surfaces II and I2 respectively, are moved again into their position of exit, shown in Fig. "I, in which they remain by a corresponding braking effect exerted upon their shafts IT and 23 respectively. As soon as the pawl 29 comes into the range of the stop 38 it is, as shown in Fig. 8, swung and then drops back into its vertical position. The individual parts now occupy again the position shown in Fig. 3 and the cycle of operation is repeated as soon as the bar I is moved again in the direction of the arrow 2: (Fig. 1).

Asthe cam members 35 and 35', disengaging the arms 39 and 39' respectively from the brake mechanism, are, by means of the

bars

33 and 33" and the

arms

34 and 34", kinematically connected to the devices I4 and I4 respectively for limiting the movements of the thread guide bars 5 and 6, adjustment of the devices 14, I4 automatically effects a corresponding adjustment of the cam members 35 and 35.

What I claim is:

1. A device for limiting the movement of thread guide bars in flat knitting machines comprising a plurality of blocks adjustably mounted on a supporting bar and each provided with' a projection extending into the path of travel of said thread guide bars, shafts mounted upon said blocks, locking arms adjustably connected to said shafts and adapted to cooperate with stops on said thread guide bars, lever arms fixed to said shafts, a roller carried by each of said lever arms, a slidably arranged bar moved in accordance with said thread guide bars, locking means carried by said slidably arranged bar and cooperating with said lever arms for moving said locking arms into and out of engagement with said stops on said thread guide bars, the arrangement being such that said locking arms, by their engagement with said stops on said thread guide bars, prevent recoil of the latter bars.

2. A device for limiting the movements of thread guide bars in flat knitting machines comprising a plurality of blocks adjustably mounted on a supporting bar and each provided with a projection extending into the path of travel of said thread guide bars, bearings provided at the upper surface of each of said blocks, a hollow shaft frictionally journalled in said bearings 01 each of said blocks, a locking arm adjustably connected to one end of each ofsaid hollow shafts and adapted to cooperate with a stop attached to one of said thread guide bars, a lever arm fixed operative portion arranged at lower level, provided in the operative direction of movement behind said elevated operative portion, an inclined operative, portion connecting said two operative portions arranged behind eacliother, each of said operative portions being adapted to cooperate with the con-esponding'roller, a pawl linked to each of said lever arms, a projection,

for limiting the movement of said pawl, at-

tached to each of said lever arms, a stop carried by each locking means arranged in the path of said pawl, a solid shaft frictionally carried by each of said hollow shafts, both ends of each of said solid shafts projecting beyond the ends of each of the hollow shafts, a locking arm adjustably connected to one end of each of said solid shafts and adapted to cooperate with a stop attached to one of said thread guide bars, a lever arm fixed to the other end of each of said solid shafts, a roller carried by each of said lever arms on said solid shaft, a second set of locking members carried by said slidable bar, an elevated operative portion and an operative portion at a lower level provided in the order mentioned one behind the other in the direction of active movement, and an inclined operative portion connecting said two operative portions on each of said second set of locking members, each of said operative portions of said second set of locking members being adapted to cooperate with the corresponding of said rollers-on said. lever arms fixed to said solid shafts.

3. A device as set forth in claim 2 in which cam members adapted to disconnect a braking mechanism from said threadguide bars are connected to bent bars fixed to said devices for limitin: the movements of said thread guide bars.

WOLDEILAR HEINI'IZ. 80