US1118522A - Take-up mechanism for shoe-sewing machine. - Google Patents

Description

H. A. BALLARD.

TAKE-UP MECHANISM FOR SHOE SEWING MACHINES.

APPLICATION FILED MAY 2. 1908.

1,1 18,522, Patented Nov. 24, 1914.

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H. A. BALLARD.

TAKE-UP MECHANISM FOR SHOE SEWING MACHINES. AiPLIOATION FILED MAY 2, 1908.

1,1 18,522. Patented Nov. 24, 1914.

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HARRIE A. BALLARID, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE IBOYLSTON MANUFACTURING COMPANY, OF SOUTH BOSTON, MASSACHUSETTS, A CORPORA- TION OF NEW JERSEY.

TAKE-UP MECHANISM FOR SHOE-SEWING MACHINES.

Specification of Letters Patent.

Patented Nov. 24:, 1914.

Application filed. May 2, 1908. Serial No. 430,612.

To all whom it may concern:

Be it known that I, I-IARRIE A. BALLARD, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Take- Up Mechanism for Shoe-Sewing Machines, of which the following is a specificat on.

This invention relates to shoe-sewing machines, and has for its object to provlde a takeupmechanism of an improved character for a machine of this type.

The attainments sought by the invention are first, smoothness of action of the takeup as a preventive of breaking the thread, second, rapidity of operation in drawmg oli ex: cess thread, and third, increase in speed of the machine as a whole by reason of the mechanical perfection of the said mechanism. The first of these attainments is the result of so organizing the mechanism as to impart an initially minimum and gradually increasing degree of actuation in taking up the thread. In other words the speed of the takeup increases from zero to maximum in its course of operation and so does not subject the thread to a shock as if by a suddenly applied tension. The second attainment IS the result of the first in that the accelerating action of the .takeup permits a greater range of movement without breaking the thread, and the third may be said to be the result of the first two.

The actuating mechanism of the present invention is adapted to effect an extremely rapid drawing of the thread and a somewhat slower delivery of the same. This is es pecially adapted to lock stitch machines for the purpose of drawing down a newly formed stitch from the path of the continuously moving shuttle.

Referring now to the drawings forming a part of this specification, Figure 1 is a right side elevation of a portion of a shoe sewing machineequipped with a takeup mechanism constructed in accordance with this invention. Fig. 2 is an elevation of the takeup mechanism detached and in a different position. Fig. 3 is a section on line 3-3 of Fig. 1. Fig. 4 is a perspective of a thread-locking device. Fig. 5 is a sectional plan View of the takeup. Fig. 6 is a section on line 6-6 of Fig. 5. Fig. 7 is a left side elevation of a fragment of the takeup. Fig. 8 is a Referring first to Fig. 1, 10 represents the upper portion of a standard on which is mounted a head 11. In the head is journaled a continuously rotating power shaft 12 by means of which the several instrumentalities are actuated.

13 is a curved needle mounted in an oscillatory carrier 14:, and 15 is the casing inclosing a continuously rotating shuttle (not shown) whiclrcooperates with the needle in formingthe stitches. The needle carrier 14: is mounted upon a stud 16 at the extremity of the arm 17 of a carriage 18. The carrier l-tis also provided with an awl 19 which is arranged in the same are as the needle and which, as shown by Fig.1, is in the sole of a shoe a. The carrier is oscillated by suitable means and, when it turns so as to introduce the awl into the work (see arrow), the pressure upon the work is resisted by a presserfoot 20. The presserfootis affixed to an oscillatory carrier 21 pivotally mounted at 22 upona suitable stationary support.

In addition tothe presserfoot,the carrier 21 is provided with a thread roll 23, and (:0-

operating thread-locking members 24; and. The member 2 1 is a shoulder formed alternately clamp and release a thread cx-.

tending between them. These locking members are shown in detail in Figs. 2 and 1 in a which the arm 25 has a slot 27 which is occupied by the arm 28. Thisarm is aflixed to a rockshaft 29 which has an operating arm 28' coacting with a cam 28*. The slot 27 and arm 28 are curved in an arc of which the center is coincident with the fulcrum 22, and so the relation of the said slot and arm is not disturbed by rocking movement of the presserioot carrier 21.

30 is an oscillatory arm which is in effect a carrier for thread-guiding rolls 31 and 32. The carrier is mounted upon a stationary fulcrum 33 in the head 11 and has an extension arm 34 by which itis connected with an actuator 35. The actuator is in the form of a wrist pin carried by a continuously rotating shaft 36, and it operatively engages the arm 3% by occupying a slot 37 formed in the latter. The slot is substantially radial but it has an offset whose function is to effect a momentary dwell of the arm during a portion of the revolution of the actuator. The shaft 36 is mounted in the head 11 and carries a gear 38 which is driven by an intermeshing gear 39 affixed upon the shaft 12.

The thread 93, presumably a waxed thread, isdrawn from a suitable source of supply (not shown) and passes in the following order between the locking members 2 1% and 25 over roll -13 takeup roll 31, yielding takeuproll 40, the takeup roll 32 and thence to the needle. A looper (not shown) and any other instrumentality may be presumed to be interposed between the roll 32 and the work for completing a the stitch-forming mechanism.

The yielding takeup roll 40 is-mounted at the free end of an arm ll formed with a stem or spindle l2- and mounted in any suitable way in a stationary bearing. The bearing illustrated by means of a plate a3 attached to the casing a l of a steam heating chamber 45. One end of the stem t2 is squared and has a collar 4:6 to which is attached one end of a coiled clock spring 41:7. The other end of the spring is attached to the plate, see Fig. 6, and has a tendency to turn the stem so as to move the free end of the arm tl toward a fixed stop 43 formed on the plate. A similar stop 49 also formed on the plate limits movement of the arm in the opposite direction. In order to provide means of adjustment for the yieldingtakeup, the plate 43 is provided with slots 50 through which extend the screws 51 which clamp the plate against the steam casing. By this means the takeup arm &1, as well as the plate, may be adjusted relatively to the takeup rolls 31 and 32.

The operation of the takeup may be followed by referring first to Fig. 1 in which the needle 13 is at or near the end of its up stroke, having drawn all excess thread from the takeup and through the work. At this time the thread is clamped between the locking members 2-1" and 25, and the takeup arm 30 is at the end of the delivery stroke and at the beginning of the takeup stroke. The said arm is, however, momentarily stationary because the actuator is moving in a direction substantially radial to the axis 33 of the takeup arm, having just passed throu h a portion of the slot 37- which is concentric to the actuators axis of rotation.

During the stationary period of the takeup the shuttle (not shown) contained in the shuttle race 15 passes through the loop of thread recently drawn up by the needle, and upon. the passing of the shuttle the actuator moves into the radial portion of the slot 37 meanwhile approaching the axis 33. The arms 30 and 3-1 therefore begin to move gradually through the takeup stroke which constantly increases in speed as the individual movements of the actuator and the arm approach parallelism. By this action of the takeup arm the thread is drawn down from the path of the shuttle with a corresponding ratio of speed and when drawn tightly against the sole of the shoe the new stitch is completed. The actuator meanwhile continues to the position shown by Fig. 2, and thereby moves the takeup to the end. of the takeup stroke and the begin ning of the delivery stroke. During the latter part of the takeup stroke the quantity of thread is so reduced as to draw the yield-. ing takeup away from the stop i8 and in opposition. to the spring &7, but immediately after being drawn down as shown by Fig. 2, the thread is momentarily released by the members 52 i and 25, and the arm ll thereupon springs back to the stop 4:3 thereby drawing a fresh quantity of thread from the supply. At this point in the operation the takeup arms 30 and 3a receive no appreciable movement from the actuator whose direction of movement is again substantially radial to the axis 33. that during the last described period occurs the operation of those instrumentalities, hereinbefore mentioned but not shown, which lay the thread about the needle preparatory to a new stitch. The needle, now at its lower position starts back through the work at the same time that the takeup arm 30 starts to return to its former position shown by Fig. 1, and so a full cycle of movements is completed.

To restate the cooperate actions of the actuator 35 and the arm 34., rotation of the former at a constant rate of speed produces gradually increasing and diminishing speed in the movement of the latter. If itshould be desirable to augment the variation in the speed of the takeup the result maybe readily attained by substituting eccentric gears 52 and 53 instead of the gears 38 and 39, see Fig. 3. In the event of such substitution, the speed of the rotating actuator would be continually increasing and diminishing, and when correctly timed with relation to the arm 34, the effect would be a greater increase and diminution in the speed of the takeup.

Having thus explained the nature of my said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made or all of the modes of its use, I declare what I claim lt may be assumed.

said carrying means, said transmission.

means having provisions for causing increasing and diminishing speed of said crank pin relatively to said member.

2.. A takeup mechanism comprising 1 an oscillatory takeup arm, and a crank pin for operating the same, said arm having a substantially radial face for engaging said crank pin to effect the takeup movement,

and a curved face to effect a dwell each takeup movement.

3. A takeup mechanism comprising a slotted takeup arm, a crank pin movable in the slot of said arm for oscillating the arm, and eccentric gears for driving said crank pin at varying speed.

4. A takeup mechanism comprising an oscillatory takeup arm, and a crank pin movable in acireular path, said arm having a slot for said cranl' pin, said slot having a substantially radial face for effecting the takeup movement, and a non-radial face for eifecting the return movement and a dwell.

5. The combination with an oscillatory main takeup, of a thread clamp, revolving continuously in one direction, means operated by said crank pin for reciprocating the main takeup with a retardation in each cycle of movements, actuating means for said thread clamp arranged to open it during the retardation of the main takeup, and a yielding takeup adapted to be retracted by the action of the main takeup and to draw thread when the thread clamp is opened.

prior to a crank pin 6. The combination with a main takeup, and means for reciprocating the same; of a spring-actuated takeup disposed to be retracted by the takeup movement of the main takeup, a thread clamp, and means for operating said clamp so as to clamp the thread during the latter part of the takeup movement of the main takeup and release the thread when the main takeup is at the end of its takeup stroke, said spring-actuated takeup being arranged to draw fresh thread from said clamp.

7. A shoe-sewing machine comprising in combination, stitch-forming mechanism, a main takeup and operating means therefor, means arranged to clamp the thread until the thread-pulling stroke of said takeup is completed, and a spring takeup arranged to be retracted by the action of the thread due to said stroke of the main takeup, said clamping means being arranged to release the thread and said spring takeup being arranged to pull thread from sald clamping means while said takeup is substantially staw tionary.

8. A shoe-sewing machine comprising in combination, stitch-forming mechanism, a main takeup and operating means therefor, means arranged to clamp the thread until the thread-pulling stroke of said taken is completed, and a spring takeup arrangec to be retracted by the action of the thread due to said stroke of the main takeup, said clamping means being arranged to release the thread and said spring takeup beingarranged to pull thread from said clamping means before said main takeup has traversed any substantial part of its return or threaddelivering stroke.

In testimony whereof I have ailixed my signature, in presence of two witnesses.

I-IARRIE A. BALLARD. Witnesses P. WV. PEZZETTI, WALTER P. ABELL.

Copies of thispatent may be obtained for five cents each, by addressing the "Commissioner of Patents,

Waahington, D. 0.?

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