US395380A

US395380A - Presser-bar

Info

Publication number: US395380A
Authority: US
Publication date: 1889-01-01
Anticipated expiration: 1906-01-01

Description

H. F. CAMPBELL.

(No Model.)

PRESSER BAR.

N0. 395,380. Patented Jan. '1, 1889.

lJNiTEn STATES PATENT UEETEE.

HENRY F. CAMPBELL, OF MALDEN, MASSACHUSETTS.

PRESSER-BAR.

SPECIFICATION forming part of Letters Patent No. 395,380, dated January 1, 1889.

Application filed March 27, 1888. $erial No. 268,623. (No model.)

To all 1071/0122 it may concern:

Be it known that I, HENRY F. CAMPBELL, of Maiden, county of Middlesex, State of Massachusetts, have invented an Improvement in Presser-Bars, of which the following description, in connection with the accompanying drawings, is a specification, like letters on the drawin representing like parts.

In wood-planing machines as now commonly built much difficulty is experienced in passing under the presser-bar the boards or other pieces or strips of wood to be planed or dressed because of the friction between the under side of the PlQSSGI-bdl and the board or other pieces of wood, and especially is this the case when the wood is moist or sappy or contains pitch; and, further, the pressure of the broad lower side of the presser-bar on the wood is, under such circumstances, liable to scratch and mar the planed surface of the board.

This inventi m has for its object to over come the difficulties referred to, and I accomplish my object by constructing the presserbar with a groove on its under side to receive a roller of steel or other suitable material, the said roller having bearings in adj ustableboxes fitted in or secured to the said bar and capable of rotation in said boxes, but being prevented from vertical movement therein.

Figure l is a top view of the presser-bar detached from the planing-machine; Fig. 2, a longitudinal section of the presser-bar shown in Fig. l, the roller which forms. the bearingsnrface of my improved presser-bar being in elevation; Fig. 3, a section of Fig. 9 on line so .u, and Fig. 'i a section of Fig. 2 on line y 3 The presser-bar (designated as a whole by the letterA) is herein shown detaclied from the planing-machine with which it is used, it being in practice suppmrted above the bed of the said machine in any suitable or convenient manner as, for instance, by uprights (not shown) extended through openings a at the side of the said bar. The pressenbar is provided. with the usual lip, a and is grooved at its under side to receive a roller, a having bearings in boxes of, herein shown as fitted snugly in said groove and secured to the bar by screws 1', (see Fig. 2,) screwed from the under side up through the bearings of the roller into the presser-bar. The roller of projects below the under side of the bar, as shown in Fig. 3, and as the board or other piece of wood is pushed forward by the feeding mechanism of the planing-machine it passes readily under the bar. The roller bears upon the upper face of the wood, serving to hold the latter firmly upon the bed of the machine. The

roller a is rotated by the forward feed of the wood, and presses upon the said wood only at the point of contact with it, thereby reducing the friction of the bearing-surface upon the wood to a minimum, thus enabling the wood to be fed forward with the least possible expenditure of power. The friction of the ordinary bar on the wood is very considerable, especially when the wood is damp or gummy or contains pitch.

The presser-bar herein shown in practice adjusted vertically in the bar A without chang ing the position of the presser-bar on the machine to regulate the distance between the lip of the said bar and the work by means of adj Listing-screws Z as, for instance, the roller may be lowered from the position shown in Fig. 2 by turning the screws 1) to withdraw them from the bar, and when in the desired or adj usted position the screws 0 will be turned down in contact with the boxes a thus firmly receiving the said boxes in adjusted. position,

the screws I) preventing theboxes and rollers from dropping down and the screws 0 from moving upward.

hen the work being planed is thin or fragile, the roller must be adjusted with relation 5 to the lip of the plGSSGPlJfL-l, so as to fall an infinitesimal distance below the plane of the said lip, thereby preventing the trembling of the material under the action. of the knife and consequent gouging or chipping of the roo material. By such adjustment the wavy appearance too frequently seen in veneering and work of fine finish is entirely obviated.

I claim The lip of this 75 The resser-bar provided with the lip a In testimony whereoflhave signed my name and grooved at its under side, combined with to this speoificationin the PIGSGH ee of two sub- 10 the roller (0, and boxes (4*, fitted in the said scribing witnesses. move and means to adjust said boxes and v V b 111i "*1 5 voila-vertically independently of the presseir- HEB RX 1 C LL bar, whereby the position of the roller with \Vitnesses: relation to the resser-bar may be changed, .IA's. H. CHURCHILL, as and for the purpose specified. FREDERICK L. EMERY.