US3686997A

US3686997A - Bobbin for braiding machines

Info

Publication number: US3686997A
Application number: US81879A
Authority: US
Inventors: Reiner Strangfeld
Original assignee: August Herzog Maschinenfabrik
Current assignee: August Herzog Maschinenfabrik
Priority date: 1969-10-17
Filing date: 1970-10-19
Publication date: 1972-08-29
Anticipated expiration: 1989-08-29
Also published as: GB1302620A; DE1952457A1; CS160134B2; PL71877B1; CH510162A; FR2065968A5; SU394974A3

Abstract

Bobbin for braiding machines having a braiding spool and a thread tensioning element, comprising a locking device constituted by return stop means resiliently arranged between the bobbin and said spool and acting upon a toothed wheel operatively connected with said spool, and forward stop means which also act upon said wheel. The return stop means is preferably in the form of a locking lever while the forward stop means is preferably constituted by a bearing lever, in association with a ratchet lever pivoted thereon. The locking and bearing levers may have a common pivotal attachment to a support of the bobbin.

Description

United States Patent Strangfeld 45] Aug. 29, 1972 [54] BOBBIN FOR BRAIDING MACHINES [72] Inventor: Reiner Strangfeld, Oldenburg, Germany [73] Assignee: August Herzog Maschinenfabrik,

Am Alexanderhaus, Germany [22] Filed: Oct. 19, 1970 [21] Appl. No.: 81,879

[30] Foreign Application Priority Data Oct. 17, 1969 Germany ..P 19 52 457.3

[52] US. Cl. ..87/57, 87/22 [51] Int. Cl ..D04c 3/18 [58] Field of Search ..87/22, 55, 56, 57, 18

[56] References Cited UNITED STATES PATENTS 1,358,216 11/1920 Klein .....87/22 1,354,084 9/1920 Wildi ..87/22 1,488,032 3/1924 Chace ..87/22 1,878,890 9/1932 Robinson ..87/22 Primary Examiner-John Petrakes Attorney-Allison C. Collard [5 7] ABSTRACT Bobbin for braiding machines having a braiding spool and a thread tensioning element, comprising a locking device constituted by return stop means resiliently arranged between the bobbin and said spool and acting upon a toothed wheel operatively connected with said spool, and forward stop means which also act upon said wheel. The return stop means is preferably in the form of a locking lever while the forward stop means is preferably constituted by a bearing lever, in association with a ratchet lever pivoted thereon. The locking and bearing levers may have a common pivotal attachment to a support of the bobbin.

9 Claims, 6 Drawing Figures Patented Aug. 29, 1972 3,686,997

FIGJQ F|G.1b

INVENTOR yj N @(Qm g;

BOBBIN FOR BRAIDING MACHINES which continuously change their direction. The inventive return stop prevents the spool from rotating in the direction opposite to that of the thread run-off.

A special construction of the inventive forward stop enables the inertia forces tobe used for accelerating the rotation of the spool in the thread run-ofi direction,

thus rendering the unwinding of the thread independent of its tension.

In a known bobbin of this type, a locking lever which prevents forward movement is of the one-part construction. When the locking lever is, first of all,

released by a thread tensioning element, it is possible for the former to fall back into the same tooth gap when the tensioning element moves backward, despite the fact that the forward bobbin turning impulse is absent, and provided the locking lever is retained in the release position. A further advantage is that the thread cannot be drawn freely from the spool by manually releasing the forward stop when inserting the spool.

The object of the present invention is to avoid the disadvantages of the known embodiment.

To achieve this object, and in accordance with the invention, a forward. stop, preferably in the form of 'a bearing lever, is constructed so that a pawl preventing forward movement of the spool can no longer engage the original tooth gap of a spool wheel after the forward stop has been released when the wheel is stationary. Due to the fact that the pawl also remains released, movement of the inertia-conditioned spool can take place after the release, independently of the movements of the thread tensioning element which is conditioned by the movement of the bobbin.

The construction of the inventive device is rendered less expensive by virtue of the forward stop, in the form of a bearing lever, being pivotable by the thread tensioning element, and on which is pivotably arranged a spring-biased ratchet lever, urged in the direction opposite to that in which the spool turns. In addition to the invention. It is to be understood, however, that the drawing is designed for the purpose of illustration only and not as a definition of the limits of the invention.

In the drawing, wherein similar reference characters denote similar elements throughout the several views:

FIG. 1a schematically illustrates the inventive principle of a bobbin with a locking device, having a return step and an engaged forward stop;

FIG. lb shows a plan view of an exemplary device embodying the principle of FIG. la;

FIGS. 2a and 2b show the arrangement illustrated in FIGS. 1a and 1b with the forward stop disengaged; and

FIGS. 3a and 3b show the same arrangement with the forward stop abutting against the toothed wheel of the spool in readiness for engagement.

A locking device arranged on a bobbin is shown in the illustrations in three different working phases, 'each figure schematically showing the lockingdevice and, adjacent thereto, a practical embodiment thereof.

A bobbin support is generally designated 1, and a toothed wheel or rim coupled to a braiding spool, so as to be non-rotatable relatively thereto, is designated 2.

The arrow in the toothed wheels 2 indicate the respective run-off direction of the threads. The toothed wheel 2 is illustrated in development in the schematic FIGS. la, 2a, and 3a. FIG. la shows a return stop or locking lever 4, having a bearing point 3, arranged on the bobbin support 1 together witha forward stop or bearing lever 6 having a pawl element or ratchet lever '7 resiliently arranged thereon. Lever 6 also pivots about point 3. In the schematic illustrationsof FIGS. 1a, 2a, and 3a,

spring elements

5a, 5b, and 5c are shown to visualize the biasing action which is respectively ex erted on the return locking lever 4, the forward bearing lever 6 and the ratchet lever 7.

FIG. 2a shows the next phase in the working cycle, namely, the withdrawl of the bearing lever 6 by an impulse from a thread tensioning element (not shown), and the associated forward movement of the ratchet lever 7 acted upon by the aforementioned spring 5c.

.FIG. 3a shows the return movement of the bearing lever 6, wherein the ratchet lever 7, and thus the forward stop, or beating lever 6 itself, abuts against the the bearing lever 6 is in the readiness position. During this, it is possible freely to draw the thread from the a spool by manually releasing the forward stop when inserting the spool.

A bobbin is already known which has a forward stop in the form of a bearing lever, pivotable by the thread tensioning element, and on which is movably arranged a pawl biased by a spring opposite to the direction in which the spool runs. However, a return stop is not provided in this known bobbin. Therefore, its toothed wheel is urged backward by the spring action of the locking lever so that the forward stop can fall back into the original tooth gap in the same manner as a forward stop which would be of the one-part construction.

Other objects and features of the present invention will become apparent from the following detailed description considered in connection with the accompanying drawing which discloses the embodiments of rotation of the braiding spool in thethread run-off direction, the toothed wheel 2 can now move in the direction of the arrow (See FIG. la) until the forward stop or bearing lever 6 engages the next recess of the spool wheel, as shown.

FIG. 1b shows a practical embodiment of the inventive bobbin and locking device. The return stop' or locking lever 4, which engages the toothed wheel 2 of the spool, is pivotably mounted on the bobbin support 1 at the bearing point 3 adjacent the toothed wheel 2.

As stated before, the bearing lever 6 is also pivotably mounted in the bearing point 3 and, in the vicinity of its The return locking lever 4 and the ratchet lever 7 are interconnected by a spring element, so that the two levers are both urged toward the toothed wheel. The spring element 5 thus assumes the combined functions of the

springs

5a, 5b and 5c indicated in FIGS. la, 2a, and 3a.

The two levers, 4 and 6, engage the wheel 2 in FIG. lb in conformity with the schematic illustration in FIG. la. The locking device is then in a phase in which the thread storage device of the bobbin is adequately filled, i.e., the thread tensioning element still does not transmit an opening impulse to the forward stop 6.

FIG. 2b shows the bobbin and its locking device during the return movement of the forward stop 6, i.e., during actuation thereof by a coupling element (not illustrated). The. bearing lever 6 pivots in counterclockwise direction and lifts the ratchet lever 7 out of the toothed wheel 2.

After the opening impulse, thebearing lever 6 and the-ratchet lever 7, which latter has been moved outwardly in the meantime, are returned by the spring 5 so that the ratchet lever 7 abuts against the crest of the next tooth, in the manner illustrated in FIG. 3a so that the readiness position of the forward stop 6 is established (FIG. 3b).

While only a few embodiments of the present invention have been shown and described, it will be understood that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.

What is claimed is:

1. In a braiding machine including a braidingspool, a bobbin, comprising:

a rotatable wheel, having a plurality of teeth of uniform length disposed on its periphery, coupled to the braiding spool;

means, disposed between the braiding spool and the bobbin, pivotably mounted on the braiding machine, and biased so as to engage said teeth disposed onsaid wheel, for preventing rotational movementof said wheel in a reverse direction but permitting forward movement of said wheel; and

a pawl, pivotably mounted on the braiding machine, and biased so as to engage said teeth on said wheel, for preventing forward movement of said wheel when said pawl engages said teeth on said wheel,

whereby when said wheel is stationary, said pawl is pivoted away from said wheel out of engagement with said teeth, thereby permitting saidwheel to rotate, said pawl engaging the top surface of the tooth from which it is disengaged and slidably moving along said tooth until said pawl engages the next tooth disposed on said wheel, thereby limiting the movement of said wheel to a peripheral distance equal to the distance between said teeth disposed on said wheel.

2. The bobbin as recited in claim 1, wherein said pawl comprises a mounting lever, pivotably mounted on the braiding machine and coupled to a thread tensioning element of the machine for pivoting said mounting lever, and a ratchet lever, pivotably mounted on said mounting lever, for engaging said teeth provided-on said wheel, and biased in a direction opposite that of the forward movement of said wheel.

3. The bobbin as recited in claim 2, wherein said meansfor preventing reverse movement of said wheel comprises an L-shaped stop lever, pivotably secured at one end at a point common with the pivot point of said mounting lever, and having a first abutment's urface at its other end for engaging said teeth on said .wheel, said first abutment surface having an inclined surface directed towards the forward movement of said wheel for permitting said teeth to slidably move over said surface, and a second abutment surface, disposed perpendicular to said pivotable lever, for engaging said teeth provided on said wheel and thereby preventing rearward movement of said wheel. I

4. The bobbin as recited in claim 3, wherein said mounting lever further comprises an. abutment member, for limiting the movement of said ratchet lever, and wherein said ratchet lever is L-shaped and further comprises a semicircular recess atone end thereof for receiving said abutment member and thereby limiting the pivotable movement of said ratchet lever on said mounting lever.

5. The bobbin as recited in claim 4, wherein said abutment member is a cylindrical pin disposed perpendicular to the surface of said mounting member.

6. The bobbin as recited in claim 4, wherein said ratchet lever and said stop lever are biased to engage said teeth on said wheel by spring means, coupled to said ratchet member at one end and said stop lever at the other end.

7. The bobbin as recited in claim 6, wherein said pivot point of said mounting lever and said stop lever is

Claims

1. In a braiding machine including a braiding spool, a bobbin, comprising: a rotatable wheel, having a plurality of teeth of uniform length disposed on its periphery, coupled to the braiding spool; means, disposed between the braiding spool and the bobbin, pivotably mounted on the braiding machine, and biased so as to engage said teeth disposed on said wheel, for preventing rotational movement of said wheel in a reverse direction but permitting forward movement of said wheel; and a pawl, pivotably mounted on the braiding machine, and biased so as to engage said teeth on said wheel, for preventing forward movement of said wheel when said pawl engages said teeth on said wheel, whereby when said wheel is stationary, said pawl is pivoted away from said wheel out of engagement with said teeth, thereby permitting said wheel to rotate, said pawl engaging the top surface of the tooth from which it is disengaged and slidably moving along said tooth until said pawl engages the next tooth disposed on said wheel, thereby limiting the movement of said wheel to a peripheral distance equal to the distance between said teeth disposed on said wheel.

2. The bobbin as recited in claim 1, wherein said pawl comprises a mounting lever, pivotably mounted on the braiding machine and coupled to a thread tensioning element of the machine for pivoting said mounting lever, and a ratchet lever, pivotably mounted on said mounting lever, for engaging said teeth provided on said wheel, and biased in a direction opposite that of the forward movement of said wheel.

3. The bobbin as recited in claim 2, wherein said means for preventing reverse movement of said wheel comprises an L-shaped stop lever, pivotably secured at one end at a point common with the pivot point of said mounting lever, and having a first abutment surface at its other end for engaging said teeth on said wheel, said first abutment surface having an inclined surface directed towards the forward movement of said wheel for permitting said teeth to slidably move over said surface, and a second abutment surface, disposed perpendicular to said pivotable lever, for engaging said teeth provided on said wheel and thereby preventing rearward movement of said wheel.

4. The bobbin as recited in claim 3, wherein said mounting lever further comprises an abutMent member, for limiting the movement of said ratchet lever, and wherein said ratchet lever is L-shaped and further comprises a semicircular recess at one end thereof for receiving said abutment member and thereby limiting the pivotable movement of said ratchet lever on said mounting lever.

7. The bobbin as recited in claim 6, wherein said spring means comprises a coil spring.

8. The bobbin as recited in claim 4, wherein said mounting lever, ratchet lever and stop lever are mounted on the braiding machine so that the common pivot point of said mounting lever and said stop lever is horizontally co-linear with the mounting axis of said wheel.

9. The bobbin as recited in claim 8, wherein said mounting lever and said ratchet lever are mounted on the braiding machine so as to be upwardly disposed and engage said teeth on the upper portion of said wheel, and wherein said stop lever is downwardly disposed, in a direction opposite said mounting lever and said ratchet lever, for engaging said teeth on the lower portion of said wheel.