US3565219A

US3565219A - Flexible mount for a loom letoff brake

Info

Publication number: US3565219A
Application number: US789109A
Authority: US
Inventors: John H Nydam
Original assignee: North American Rockwell Corp
Current assignee: Draper Corp; Boeing North American Inc
Priority date: 1969-01-02
Filing date: 1969-01-02
Publication date: 1971-02-23
Anticipated expiration: 1988-02-23
Also published as: BE743965A; DE1963642A1; GB1230337A; BR6915677D0; FR2027632A1; CH507396A

Abstract

A mounting device for supporting a caliper-type brake assembly in operative position with a rotating disc on a loom which includes relative to the plane of the disc provisions for radially adjusting the assembly and in addition flexibility to permit lateral movement of the latter in a plane parallel to the axis of the disc as well as pivotable movement thereof about said axis.

Description

United States Patent Inventor Appl. No.

Filed Patented Assignee John H. Nydam Whitinsville, Mass. 789,109

Jan. 2, 1969 Feb. 23, 1971 North American Rockwell Corporation Pittsburgh, Pa.

a corporation of Delaware FLEXIBLE MOUNT FOR A LOOM LET-OFF BRAKE 6 Claims, 3 Drawing Figs.

US. Cl 188/206, 188/7 1 .1 Int. Cl ..F16d 65/02, Fl6d 55/10 Field ofSearch 188/7 1 .1

[56] References Cited UNITED STATES PATENTS 3,299,991 1/1967 DeCastelet 188/7 1 .1 FOREIGN PATENTS 250,608 3/1964 Australia 188/205(.3)

Primary Examiner-Duane A. Reger Attorney-John R. Bronaugh FLEXIBLE MOUNT FOR A LOOM LET-OFF BRAKE BACKGROUND OF THE INVENTION This invention pertains to the braking mechanism for the let-off of a loom whereby frictional restraint is provided to a yarn beam for maintaining tension on the yarn being unwound. More particularly the invention pertains to a movable support for a caliper-type brake mechanism which shall follow the normal and expected deviations of a rotating disc.

It is known to apply brakes of various types to the yarn beam of a loom for restricting its rotation to maintain tension on the yarn. A brake found to be highly suitable for this purpose, is the caliper type where a disc, mechanically connected with the yarn beam, is frictionally restrained by opposing brake pucks. The housings which contain the brake pucks have been supported by brackets secured to the framework of the loom. There has been no allowance for movement of the housings so that any variations in the plane of rotation which the disc might take have resulted in excess friction or binding between the parts and fluctuations in the yarn tension. The variations between the rotating disc and the fixed brackets are relatively minor, yet the fluctuation in tension readings may be significant and will appear adversely in the woven material.

SUMMARY OF THE INVENTION This invention provides a mounting bracket for the brake of a friction let-off which, by means of a flexible member permits the brake pucks or shoes to stay parallel with the rotating control disc at all times. The tension readings on the yarn will remain more nearly constant due to the lack of outside or undesirable friction caused by deviations in the rotating disc.

It is therefore a general object of this invention to devise a mounting bracket which will allow a caliper type brake to alter its position and conform to that being taken by the rotating disc.

It is a further object of this invention to devise a mounting bracket which shall provide rigid vertical support, yet allow slight changes in position through rotative or tilting movement.

It is a still further object to devise a mounting bracket for a caliper type brake which shall be comparatively inexpensive to manufacture and simple to apply.

These and other objects of the invention will become apparent as further details are disclosed.

BRIEF DESCRIPTION OF THE DRAWING The invention will be described by reference to a specific embodiment thereof as illustrated in the accompanying FIGS. of drawing, wherein:

FIG. 1 is an elevation as applied to the side of a loom;

FIG. 2 is a plan view of that shown in FIG. 1; and

FIG. 3 is a section taken on line 3-3 in FIG. 1.

DESCRIPTION OF THE PREFERRED EMBODIMENT Now referring to FIG. 1, a portion of a loomside is shown to orient the invention in relation to any common weaving loom. A friction let-off, designated generally as 21, is shown in this disclosure as a caliper-type brake, a known means for letting-off warp yarns under tension. A rotatable disc 22 is secured for rotation with a shaft 23 which may be positively driven in any convenient manner such as gearing (not shown) in mesh with the yarn beam gear (also not shown). Friction let-offs of various types, being well known in the art, will not require illustration here for complete understanding of their function. It is sufficient to say that the disc 22 is in direct con- 'nection with a yarn beam and any frictional restraint or release applied to the disc will similarly affect the beam.

Caliper-type disc brakes are commercially available for use in installations of this kind. The one shown in the drawing may be obtained from H-H Products Company Inc. of Milwaukee,

Wisconsin. It includes opposingly disposed

interconnected housings

24 and 25 each containing a

brake puck

26 and 27 with at least one puck being movable toward the other and an.

intervening space through which the disc 22 will rotate (FIG.

3). Controlled hydraulic or pneumatic pressure is applied to the housing 24, as shown in FIG. 1, by a hose 28. In the brake 5 shown herein, the puck 27 is stationary while the puck 26 is movable toward and away from the disc 22. The whole combination is permitted slight movement along a bolt 29 to compensate for gradual wear upon the brake pucks.

- The brake 21 is secured by screws 30 and 31 to the upper surface of a bracket 32'which will support the brake 21 in position to act upon the disc 22. The bracket 32 has an upwardly angled finger :33 which is directed toward, but separated from, a rigid arm 34 (FIG. 2). The arm 34 is pivotally supported by a-ball joint end 35 fastened to a lug 36 which is held by screws 37 and'38 into the loomside 20. The finger 33 and arm 34 are maintained in spaced separation by a flexible flat spring 39 which is fastened'to each by pairs of screws 40 and 41 (FIG. 2). To reinforce the spring 39v at the areas of contact with the finger 3'3 and arm 34, two pairs of plates 42-43 and 4445 are fastened to opposite sides of the spring 39 by the

screws

40 and 41. The

plates

42 and 43 are separated from the

plates

44 and 45 by the same distance of separation as that between the finger 33 and arm 34 as illustrated at point 46 in FIG. 2. The spring 39 is overlapped at its ends by the reinforcing plates and conforms generally to their configuration (FIG. 1).

Beneath the bracket 32 and bearing upwardly upon its under surface is an adjusting screw 47 threaded through an angular bracket 48 held by screws 49 .upon theloomside 20. The bracket 32 will be held on the point of the screw 47 and may be raised or lowered to be properly positioned in relation to the disc 22. The bracket 32 may pivot or move laterally upon the screw 47 as it rests loosely thereon.

As the disc 22 is caused to rotate it may deviate from a true circular path or from a single plane. Were the brake mechanism 21 fastened securely to the loomside 20, deviation would result in unnecessary friction or binding of the disc 22. With the instant mounting device, the bracket 22 which supports the brake 21 is flexible and movement may be effected relative to the supported rigid arm 34. Whenever angular pressure is exerted against the brake 21, the spring 39, through a flexing motion, will maintain a continual parallel relationship between the brake 21 and the disc 22.

In view of the above, it will be seen that the several objects of the invention are achieved'and other advantageous results attained.

I claim:

1. A disc brake assembly comprising a rotatable disc, a caliper embracing a peripheral portion of said disc and selectively operable to clamp said disc to restrain rotation thereof, the improvement comprising:

' a. mounting means supporting said caliper in operative relationship with a peripheral portion of said disc embraced thereby and permitting limited lateral movement of said caliper relative to the plane of the disc and pivotable movement thereof about an axis parallel to the axis of said disc; and

b. means to establish the pivotal position of the caliper relative to the periphery of the disc without restraining the limited lateral movement of the caliper relative to the disc.

2. For a loom let-off mechanism having a positively driven 65 rotating disc, a caliper-type brake assembly disposed for applying frictional restraining forces upon opposite sides of said disc which includes:

a. a mounting device for supporting said brake assembly in an operative relationship with said rotating disc including a flexible connecting member fastened intermediate the ends of said mounting device;

b. said mounting device further including a supported end and a supportingend and said connecting member permitting relative movement between the supporting and supported ends;

c. the supported end including a rigid arm pivotably secured to the loom and removably fastened to said connecting member;

d. said supporting end including a bracket removably fastened to said connecting member and having said brake assembly fastened upon the upper surface thereof wherein said bracket and said arm are maintained in spaced separation by said connecting member; and

e. said connecting member defining a flat spring adapted to be fastened securely to both said bracket and said arm.

3. The mechanism as defined in claim 2, wherein said mounting device further includes at least two spaced apart reinforcing plates partially overlying and fastened to said

Claims

1. A disc brake assembly comprising a rotatable disc, a caliper embracing a peripheral portion of said disc and selectively operable to clamp said disc to restrain rotation thereof, the improvement comprising: a. mounting means supporting said caliper in operative relationship with a peripheral portion of said disc embraced thereby and permitting limited lateral movement of said caliper relative to the plane of the disc and pivotable movement thereof about an axis parallel to the axis of said disc; and b. means to establish the pivotal position of the caliper relative to the periPhery of the disc without restraining the limited lateral movement of the caliper relative to the disc.

2. For a loom let-off mechanism having a positively driven rotating disc, a caliper-type brake assembly disposed for applying frictional restraining forces upon opposite sides of said disc which includes: a. a mounting device for supporting said brake assembly in an operative relationship with said rotating disc including a flexible connecting member fastened intermediate the ends of said mounting device; b. said mounting device further including a supported end and a supporting end and said connecting member permitting relative movement between the supporting and supported ends; c. the supported end including a rigid arm pivotably secured to the loom and removably fastened to said connecting member; d. said supporting end including a bracket removably fastened to said connecting member and having said brake assembly fastened upon the upper surface thereof wherein said bracket and said arm are maintained in spaced separation by said connecting member; and e. said connecting member defining a flat spring adapted to be fastened securely to both said bracket and said arm.

3. The mechanism as defined in claim 2, wherein said mounting device further includes at least two spaced apart reinforcing plates partially overlying and fastened to said spring.

4. The mechanism as defined in claim 2 wherein said mounting device further includes two spaced apart reinforcing plates fastened upon each side of said spring in opposing matching relationship.

5. The mechanism as defined in claim 3 which further includes a vertically adjustable pivot point means disposed beneath said bracket for providing support while allowing pivotal and lateral movement by said bracket.

6. The mechanism as defined in claim 5 wherein said pivot point means includes an adjusting screw supported beneath said bracket and upwardly directed.