US1417978A - Needle-guide-controlling means for sewing machines - Google Patents

Description

M. T. DENNE.

NEEDLE GUIDE CONTROLLING MEANS FOR SEWING MACHINES APPLICATION FILED SEPT. 30. l9l8.

1,417,978. Patented May 30, 1922.

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MARK THOlVl'AiS DEFINE, OF RUSHDEN, ENGLAND.

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Specification of Letters latezit.

Patented May '30, 1922.

Original application filed September 22, 1914, Serial No. 863,025. Divided and this application filed September 30, 1918.

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Be it known that I, MARK THoMA-s DENNE, a subject'of the King of Great Britain and Ireland, residing at Ru'shden, Northamptonshire, England, have invented new and useful Improvements in Needle-Guide-Controlling Means for Sewing Machines, of which thefollowing is a specification.

This'invent-ion has reference'to improvements in needle guide controlling means for sewing machines of the type known as out sole stitchers used for stitching the-'outsole to the welt or to the middle sole of boots and shoes and in which a curved needle and a curved awl are employed, and the present application is a division of my application Se. No. 863,025, which has matured into Patent No. 1,301,400, dated April 22, 1919.

My invention consists in the combination with an oscillatory needle carrier anda needle sustained thereby, of an oscillatory needle guide actuated by a spring in its forward movement and by engagement with the needle carrier in its rearward movement, and means actuated by the needle-operating lever for locking the said guide to keep it stationary during a portion of the travel of the needle while permitting its movement during other portions of the travel of the needle so that the needle may be'properly supported both during the down and the up I stroke of the needle.

The invention is illustrated in the accompanying drawing, in which Fig. 1 is a side elevation, and

Fig. 2 is a plan view showing the'needle and needle guide arranged in accordance with my invention, and the mechanism for operating same.

Fig. 3 is an enlarged view of the needle segment and needle guide showing the' supporting stud in section and a portion of the frame in dotted lines;

Fig. 4: is a section on the line k4, Fig. 3; Fig. 5 is a plan view of Fig. 3.

The needle stock or segment is indicated at land is carried on a suitable stud 4:0 supported in the frame 12. This segment is provided with gear teeth 41 which mesh with gear teeth 42 formed on a needle-operating lever. in two parts 2 and 22 which are connected together by means of a bolt or stud 23 supported in a portion of the frame 12. The part 22 has at one end a usual cam roll 24 This needle-operating lever is formed Serial N0. 256,21 3.

which co-operates with a suitable cam, and s'aid'part is also provided with a bearing portion 3 which is journaled in the frame of the machine. The part 2 is provided with teeth or the liked which engage recesses the bearing 3, and by this means the two parts are rigidly clamped together. The needle guide is indicated at 5 and it is mounted on a carrier 6 which rocks on a hub or boss 26 formed on the needle segment, all as shownbest in Fig. 4:.

- My present invention relates to the means for controlling this needle guide by which it is positively locked from movement when it has completed its forward movement and while the needle is engaged in the work and during the backward movement of the needle until the barb of the needle comes nearly to the needle guide, at which time the latter is unlocked and is allowed to move backwardly with the needle during the final backward movement of the latter. The needle-guide carrier 6 is provided with a pin 11 which operates in a slot 126 formed in the bracket 12, and this pin is acted upon needle-guide is locked in its forward position by means of a bolt or its equivalent 7 which is slidably mounted on the bracket 12 and the front end of which is adapted to engage a notch 27 formed in the guidecarrier 6. This bolt 7 is provided at its rear end with a cam slot 29 in which is received a pin 8 extending from the portion 2 of the needle-operating lever. The cam slot 29 has the shoulder or offset portion 9 which is so shaped and situated that when during the downward movement of the portion 2 of the lever the latter has turned the. needle segment backwardly to such a point that the barb of the needle is at or near the guide 5, said pin acts against the shoulder 9 thereby retracting the bolt 7 and withdrawing it from the notch 27.

Means are provided whereby when the guide carrier is thus unlocked it will be moved backwardly by further backward movement of the needle segment. This is accomplished by means of a pin 6 which projects from the guide-carrier 6 and operates in a segment-shaped recess 36 in the needle segment. When the needle segment has been turned backwardly to a position which will result in unlocking the guide-carrier, the upper end of the recess 36 will then engage the pin 6 so that during further backward movement of the needle segment, the latter Will move the guide-oarrier backwardly against the action of the spring 10.

When the needle starts forwardly or downwardly again, the guide-carrier will follow the movement of the needle under the influence of the spring 10 until the lever 2 has been carried upwardly into a position to passabove the offset portion 9 of the slot 29, at which time the locking member 7 will be moved forwardly into the recess 27, thus locking the guide-carrier from further rotative movement. The needle will then continue its forward movement through the work and during the next backward movement of the needle, the guide carrier will remain locked until the barb vof the needle arrives at or near the guide 5, at which time the guide carrier will be again unlocked and then moved backwardly by the needle segment.

What I claim as my invention and desire to secure by Letters Patent is In a sewing machine, the combination with an oscillatory needle segment and a needle carried thereby, of an oscillatory needle-guide, a spring acting normally to impel the guide forwardly, a needle-operatto move backwardly' with the needle segment during the finaljbackward movement of the latter.

In testimony whereof I have signed my name to this specification.

MARK THOMAS DENNE.

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