US1993643A

US1993643A - Appliance for unwinding pack thread or the like

Info

Publication number: US1993643A
Application number: US434114A
Authority: US
Inventors: Behrendt Werner
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-03-13
Filing date: 1930-03-07
Publication date: 1935-03-05
Anticipated expiration: 1952-03-05

Description

March 5, 1935. w. BEHRENDT 1,993,643

APPLIANCE FOR UNWINDING PACK THREAD OR THE LIKE Filed March '7, 1930 VI/ BehrehJ Patented 'Mar. 5, 1935 UNITED STATE-S APPLIANCE FOR UNWINDING PACK THREAD OR THELIKE Werner Behrendt, Application March 7',

I ugano, Switzerland 1930, Serial N- 434,114

In Switzerland Marchl3, 1929 2 Claims.

This invention relates to an appliance for unwinding pack thread, by means of which rolls or spools of pack thread of different lengths can easily be unwound from the beginning rightto the end, and can be braked with a constant braking force. According to the invention the appliance comprises a frame, a shaft rotatably supported in the frame and adapted to hold the spool of pack thread, two discs mounted on the said shaft, a pair of rotatably mounted cylinders bearing upon the peripheries of the discs, a pulley at each end of each of the cylinders, two'endless helical springs, each passing around the two pulleys at one end of the cylinders, the said springs pressing the cylinders into contact with the peripheries of the discs and being adapted to exert thereby a constant braking pressure to prevent excessive unwinding of the pack thread, and means for adjustingthe stress in the said springs.

The apparatus is preferably so constructed that it can be used either as a table appliance, a suspended appliance or an appliance fitted to a wall, and will work equally well in any of these positions.

In the drawing I Figure 1 is a longitudinal sectional elevation of the first constructional form,

Figure 2 is a section on the line 2-2 of Figure 1.

To a base board 1 is secured a supporting frame consisting of two

side members

2 and 3 and a top bar 4. The side member 2 is formed with a slot 5 open in the front for the suspension of one end of a carrying shaft 6, the other end of which is inserted in a hole in the side member 3. In a cylindrical expansion of the slot 5is rotatably supported a sleeve 7 provided with a longitudinal slot 6' and with a hand lever 8. By rotating the sleeves 7 into the position shown in dot and dash lines in Figure 3 the slot 5 in the side member 2 can be closed, and the shaft 6 thereby prevented from dropping out in any position of the apparatus. Pins 9 limit the deflection of the hand lever 8. A split pin 10 at the lefthand end and a stepped portion at the right hand end of the carrying shaft 6 prevent lateral displacement of the latter.

The shaft 6 has a prismatic centre portion 11, and its outer portions 12 are provided with righthanded and left-handed screw-threads, upon which'there are screwed wing nuts 13. Between these nuts pressure discs 16, which are formed with axial apertures and each equipped with a metal plate 14 provided with a hub 15, are mounted loose upon the shaft 6. The discs 16 have concave internal surfaces and may be of wood, Upon each hub is mounted loose an exchangeable cone 17, over which the central sleeve 18 of a spool of pack thread 19 fits. By tightening the nuts 13, the sleeve 18 is forced on to the cones 17, and the spool 19 is pressed between the discs 16, as a result of which, during the unwinding of the pack thread, the latter is prevented from slipping in between the spool and the discs.

The cones 1'7 enable spools with sleeves 18 of different diameters to be gripped. It is also possible, by adjusting the discs 16, the cones 1'7 and the nuts 13, to grip spools of different lengths.

To the top bar 4 is secured a guiding wire 20 for a thread guide 21, through the eye of which the pack thread leaving the spool runs. A simi-' lar thread guide wire 20 and thread'guide 21 are also secured to the lower parts of the

frame members

2 and 3, in order also to enablethe packthread to be unwound from the under side of the spool if desired.

Each

side member

2 and 3 is formed with two

vertical slots

22 and 23 in the same plane, in which the journals 24 of two loose brake cylinders 25 bearing upon the peripheries of the discs 16 are adjustably guided. The ends of the cylinder spindles 24 carry rollers or pulleys 26. Round the pulleys on the same side is passed an endless helical spring 2'7, by which the cylinders 25 are pressed against the peripheries of the discs 16 and thus exert a braking action upon the discs '16 as the pack thread is being pulled off, so that the unwinding of an excess of pack thread is prevented. Since the cylinders 25 rotate, the unwinding of the pack thread takes place quite easily. It is obvious that the braking effect will always be the same, whether the spool diameter is'great or small. Since the braking acts with considerable leverage it is very effective so that no excess pack thread comes unwound. If desired, the spring tension may be made adjustable.

Each of the frame side members2 and 3 has on the inner side a recess 28 for the reception of a razor blade 29 for cutting off the unwound pack thread. The edge of this blade projects somewhat beyond an open marginal slot 30 in the side .member, so that the pack thread introduced into the slot 30 can easily be cut off by pressing it against the razor blade. In a guide 31 on each of the

side members

2 and 3 is slidably mounted a member 32 which holds the blade fast, and which is provided with a marginal notch.

The apparatus as a whole is preferably covered with a two-part protective hood or cover 33, the two parts being adapted to be fastened to one anotherand to the base plate -1 by means of a lug 34 and a spring pawl 36 which engages in a recess 35 in the base board 1, is supported on the cover, and can be actuated from the outside. The cover is provided with

slots

37 and 38 for the passage of the thread guide rods 20, and leaves the parts of the

side members

2 and 3 that receive the cutting blades 29 exposed.

The pressure discs 16 may alternatively be provided directly with screw threads; in which, case special wing nuts 13 are omitted;

The lower thread guide wire may if desired be,

secured to the base board.

What I claim is:- V

1. In a device for unwinding thread; from a spool the combination of a frame, a shaft rotatably supported by the frame, two pressure discs rotatably mounted on the shaftzat, each;- end ofi the spool, means to press the pressure discs against the spool, two cylinders rotatably and slidably supported by the frame bearing on the periphery of the pressure discs, pulleys at the ends of the two cylinders, endless helical springs trained around the pulleys to yieldably hold the cylinders in position against the pressure discs to prevent excessive. unwinding of the, pack thread.

2; A device as claimed in claim 1; in which the means for pressing the pressure discs against the spool is provided for by a shaft having righthanded and left-handed screw threads, two wing nutswhich arescrewed onto the shaft, and two pressure. discs provided with hubs in order to grip the, spool when thawing nuts are screwed toward the spool;

WERNER BEHRENDT.