US1316578A - Kbtotter-head eor bzktders - Google Patents

Description

0. S. JOHNSON.

KNOTTER HEAD FOR BINDERS. APPLICATION FILED JUNE 12, 19!].

1 ,3 1 6, 578. Patented Sept. 23, 1919.

INVENTOR 3% g??? BY%JM W ATTORNEY OSCAR s. JOHNSON, or MAKoTI, NORTH DAKOTA.

KNOTTEKHED r012. nin'nnns. r

To all who it Maj concern v v Beit known that I, Oscar: S. JOHNSON, a

citizen of] the United States, residing at Makoti, in'the county of Ward and State of North Dakota, have invented certain new and useful Improvements in Knotter-Head's for Binders, of which; the following isga specification.

This invention relates to agricultural im plements, and more particularly to knotter heads for binders.

The main object of the invention is to provide simple and efficient means whereby wear and lost motionin]theltyihgmechanism of the knotter head of a binder may be compensated for and the tying thereof accurately effected at the proper time.

After the tying mechanism for binders has been used to some extent, it sometimes misses and oftentimes forms a knot in one end while the other end of the securing. device slips through. This is owing to the fact that the knotter jaw wears a groove in the knotter jaw cam thereby causing lost motion and preventing the knotter jaw from lookingat the proper place, such as is necessary to cause the accurate tying of a bundle. It is to overcome this objection and insure the accurate operation of the tying mechanism that this device is designed.

With the foregoing and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed may be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings Figure 1 represents a side elevation with parts broken out of a knotter head-casting and breastplate equipped with this invention, Fig. 2 shows a detail perspective view of the spring employed forholding the knotter jaw cam in operative engagement with the knotter jaw,

Fig. 3 is a plan view of the knotter jaw cam detached; and

Fig. 4 is a detail plan view.

In the embodiment illustrated, a knotter head casting 1 is shown having a breastplate 2 of ordinary construction secured thereto and a knotter jaw cam 3 also car- Specification of Letters Patent.

I Patented Sept. 23, 1919.

Application meetin 12, 1917. seria' no. 1 14.295.

ried thereby, said cam being constructed in the form shown in Fig. 1 and secured to the casting 1 by a fastening element here shown in the form of a screw 4:. This jaw cam 3 taperstoward one end and has outstanding cain flanges 5, an aperture 6' being provided at its rear endfor the passage of the seouringscrew 4.

A knotter of ordinary constructionnot shown provided with the usual jaw operates inconnection with the cam 3 to effect the tying operation.

The-continuous operation of the device causes the knotter jaw to wear a groove in the cam 3, and to overcome the objectionable lost motion occasioned thereby, I have provided .a plate spring 7 which is secured at one end to the breast-p-late 2, preferably by a bolt 8, one end of said spring being here shown bent at right angles as indicated at 11 in Figs. 1 and 2, and which is passed through an opening 2 in the breast-plate to hold the spring against turning. This spring 7 is preferably made in the form of a compound curve, and the free end thereof bears normally against the lower edge of cam 3 and operates to force it upwardly thereby presenting a new wearing surface for contact with the knotter jaw. Means for adjusting the tension of this spring is here shown in the form of a set screw 9 which passes through the breast-plate 2 and engages the lower face of spring 7 and is shown clearly in Fig. 1. Thus it will be observed that the cam 3 may have its position varied according to the tension of spring 7 and that this tension is regulated by said set screw although obviously other means may be employed if found desirable.

The breast-plate 2 is here shown secured to the knotter head casting 1 by means of a bolt 11 held in operative engagement therewith by lock nuts 12.

It is well known in devices of this character that the knotter must revolve once around with the twine in order to tie a knot, and in so doing, it is necessary that the knotter jaw cam 3 be roperly adjusted to effect the tying operation, and this turning of the knotter in time will wear the groove above referred to, causin lost motion, which results in the knotter aw looking at the wrong place.

The spring 7 which is herein employed for overcoming lost motion between the parts, is made of steel and of a suitable thickness to prevent breakage and by disposing it as herein shown and? described; it

is entirely out of the way of the other parts havlnga lateral projection on its lower edge of the knotter head. In order to attach this cam adjusting means it is only necessary to drillitavo holes inthe breast-plate 2; one f'or the bolt 8 which connects spring. 7 to said. breastplate and one for the set screw 9 which accomplishes the adjustment of the tension of said, springand the oblong open h1g2 for, the passage of the hooked end or 11 of: the spring.

Fronithe foregoing description, taken in connection with the accompanying drawings,,

the advantages of: the construction; and, of the method of'operation willv be readily ap- P QJiBIItBl/OK those skilled 1 in. the art to which the invention appertains and while I; have.

described. the principle of operation. of. the invention together with the devicewhich: I: now. consider to, be. the best, embodiment thereof, I desire vto have; it 'understoo d, that the device-shown ismerely illustrative and the scope of the claimed invention.

I claim 7 The combination of a knotter jaw cam and a breast-plate having an opening there- 3 in; of a flat spring meta]. strip bent in the form of a compound curve having a'right angularly disposed arm at one end passed through the opening in the breast-plate to hold the. spring. against lateral movement, a bolt seeuringsaid end to said breast-plate, the other end of said plate bearing flatly against said'lateral projection on said cam, and a bolt adjustably :mounted in said breastrplate and engaging the lower: face of said spring to force the free end thereof into yielding engagement with said cam.

In testimony whereof I aifix my signature in presence of two witnesses.

I OSCAR, S; JOHNSON. Witnesses:

'ENoerr Swanson, E.O.-LERBERG.

Copies 01! this patentimay be obtained for five cents each, by'addressing the Commissioner o1 Patents,

Washington, D. 63." p

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