US1870197A

US1870197A - Paper feed mechanism

Info

Publication number: US1870197A
Application number: US344481A
Authority: US
Inventors: Edward W Sibley
Original assignee: Remington Rand Inc
Current assignee: Remington Rand Inc
Priority date: 1929-03-05
Filing date: 1929-03-05
Publication date: 1932-08-02
Anticipated expiration: 1949-08-02

Description

g- 2, 1932- E. w. SIBLEY 1,870,197

PAPER FEED MECHANISM Filed March 5, 1929 *2 Sheets-Sheet 1 @ZJAGRLMJL Aiiorneg g- 2, 1932- E. w. SIBLEY 1,870,197

PAPER FEED MECHANISM Filed March 5, 1929 2 Sheets-Sheet 2 Patented Aug. 2, 1932 UNITED STATES PATENT OFFICE EDWARD W. BIBLEY, OI

KENMORE, NEW YORK, ASSIGNOB T REMINGTON BAND INC,

01 BUFFALO, NEW YORK PAPER FEED MECHANISM Application filed March 5, 1929. Serial No. 344,481.

- This invention relates to mechanism for feeding paper and other flexible material and has particular relation to mechanism for intermittently feeding a strip or ribbon of paper or the like to a device which separates it into sections of predetermined length or performs some other operation thereon;

One of the objects of the present invention -is to provide a paper feeding mechanism of the character described which will intermittently feed a strip of paper with an accelerating and decelerating rate of motion at the commencement and conclusion of each feeding operation whereb slippage heretofore encountered between t e paper and the feeding mechanism-caused by the sudden starting and stopping thereof is minimized.

. Another object of the invention is to provide a device of the character described so constructed and arranged that the length of the feeding stroke is constant notwithstanding inaccuracies due to wear or lost motion between the several driving elements.

A further objectof the invention is to provide a mechanism of the character descr1bed that is simple and rugged in construction and arrangement and which may be quickly attached to or incorporated in a machine designed to perform various operations on the paper such as cutting it into predetermined lengths, for card indexes, or for printing and perforating the same.

In the accompanying drawings, Fig. 1 is a side elevational view of a portion of a paper feeding mechanism constructed in accordance w1th the present invention.

Fig. 2 is a plan view of the structure shown in Flg. 1.

Fig. 3 is a vertical sectional view taken on line 33 of Fi 2.

Referring to the rawings, a feeding mechanism constructed in accordance with theinvention is shown as comprising a bracket having side members 1 and 2' which are secured at their inner ends to a portion of the frame 3 of the machine with which the a paratus is employed and which are connecte at their forward ends by a transverse member 4. A shaft 5 is rotatably mounted atone end in a bearing 6 provided in the frame 3, and at the other end thereof in a sleeve 7 which is fixed in the member 4. This shaft is connected at its inner end by a coupling 8 to one end of a shaft 9 journalled in bearings 10 and 11 of the machine. The shaft 9 is a part of the feeding mechanism of the machine with which the present device is employed and carries a pair of paper feed rollers 12 for frictional engagement with the edges of a strip or ribbon of paper 13. The paper 13 is maintained in contact with the rollers 12 by means of a pair of rollers 14 which are fixed to a shaft 15. This shaft is rotatably mounted at its outer ends in ball bearings 16 which are in turn mounted for vertical slidmg movement in uides 17. The rollers 14 are maintained in rictional engagement with the paper 13 by means of sprmgs 18 which bear upon the slide bearings 16 and urge them downwardly.

A gear wheel 19 is rotatably mounted on the sleeve 7 and carries an arm 20 upon which a pawl 21 is pivotally mounted for operative engagement with a ratchet wheel 22. The

. ratchet wheel 22is fixed to the shaft 5 and is formed with a central cylindrical portion 23 and a pair of oppositely extending

arcuate flanges

24 and 25, the flange 24 being provided with pawl engaging shoulders 26 and so 27 and the flange 25 having pawl engagin shoulders 26' and 27 The pawl 21 is urge inwardly against a stop pin 28 and into the path of movement of the shoulder 26 by means of a leaf spring 29 which is secured to the arm 20 bymeans of screws 30.

The gear wheel 19 is rotated alternately in opposite directions by means of a rack bar 31 which is maintained in intermeshin engagement therewith by a track or gui e 32. This guide is formed with a hub portion 33 wh1ch is mounted for oscillatory move ment upon the sleeve 7. v

The lower end of the rack bar 31 is pivotally connected to a crank arm 34 v(Fig. 1) which is fixed to a shaft 35 of the machine. The rotation of the arm 34 during the normal operation of the machine reciprocates the rack bar 31 within the uide member 32 with an accelerating and decelerating rate 191! of movement at the commencement and conclusion of each stroke thereof thus imparting a corresponding accelerating and decelerating rotary motion to the gear wheel 19 and the parts driven thereby.

With particular reference to Fig. 1 .in the drawings, it will be noted that as the crank arm 34 rotates upwardly from the position shown on its inactive stroke, the gear 19 will first be caused to rotate in a. counter-clockwise direction, carrying with it the arm 20 and the pawl 21. The ratio between the circumference of the gear 19 and the throw of the rack bar 31, as determined by the length of the crank arm 34, is such that with each re ciprocation of the rack 31, the gear 19 will be rotated slightly more than one complete rotation so as to insure that the pawl 21 will drop behind the shoulder 26 of the ratchet wheel 32. At this point, the direction of rotation of the gear is reversed by the downward movement of the rack bar 31. Through the first half of the downward movement of the rack bar 31 or during the first 90 of rotation of. the crank 34, the speed of the ar 19 is constantly accelerating. During the last half of the movement of the rack bar 31, the s eed thereof and that of the arts driven t ereby is constantly deceleratmg. By reason of this accelerating and decelerating movement of the s acing mechanism, the stri 13 driven by t e rollers 12 is intermittently fed with a gradually increasing and decreasing rate of movement at the beginning and conclusion of each stroke, thereby minimizing the possibility of slippage between the paper and its driving instrumentalities, and also eliminating wear occasioned b the sudden stopping and starting of the mec anism.

In order to prevent the ratchet wheel 22 from overrunning due to looseness in the several parts or the inertia of the parts themselves at the conclusion of the active stroke of the rack 31 and gear wheel 19, a pawl or stop member 36 is ivotally mounted upon the frame 3, as at 3 .for engagement with the shoulder 27 of 'the flange 24. A rod 38 is provided with a yoke 39 at its upper end for pivotal engagement with the pawl 36 and is slidably mounted at its lower end in a lug 40 provided on the frame 3. This rod is normally urged upwardly to maintain the pawl 36 in engagement with a stop pin 41 by means of a coil spring 42 which encircles the rod 38 between the lug 40 and the yoke 39. The tension exerted by this spring is suflicient to provide a substantiall resilient sto for the ratchet when the shou der 27 carried thereby en ages the pawl 36 but is adapted to yield su ciently to permit the flange 24 to pass by the pawl 11 on the positive movement of the rack 31. T is construction insures that the motion of the ratchet wheel 22 and parts driven thereby will be arrested each time the crank 34 passes dead center at the conclusion of its feeding stroke, notwithstanding an lost motion which may exist or may deve op in the driving elements.

At the commencement of the downward stroke of the rack 31, the gear 19 first takes up the space between the pawl 21 and the shoulder 26 of the ratchet wheel 22 and then begins to rotate the ratchet wheel 22 in a clockwise direction. The shoulder 27 of the flange 25 simultaneously depresses the pawl 36 against the action of the spring 42 until the s oulder 27 snaps over the pawl 36. The ratchet wheel 22 continues to rotate until the shoulder 27 re-engages the pawl .36 which at this point acts as aresilient abutment tending to maintain the ratchet wheel 22 in positive enga ement with the pawl 21 and prevents bac r lash between the gear and rack and other mechanical'inaccuracies from evidencing themselves in the amount of throw transmitted by the pawl 21.

The ratchet wheel 22 is prevented from rotating backwardly upon the return or inactive stroke of the rack 31 by means of a roller 43 which is disposed between the cylindrical portion 22 of the ratchet wheel 22 and a cam plate 44 which is secured to the side member 1. The roller 43 is urged downwardly by means of a spring 45 and is maintained against axial displacement by means of a pin 46 carried by the cam plate 44 for engagement with a circumferential groove 47 provided in the roller.

From the foregoing it will be apparent that a very simple and efiicient mechanism is provided which may bequickly attached to or incorporated with the mechanism of a machine requiring a feeding device such as that described with very few if any changes in the construction thereof.

The invention may be modified in construction and arrangement and mode of application withoutdeparting from the invention as set forth in the appended claims.

What is claimed is:

1. In a paper feeding mechanism, the combination of a lurality of members adapted to frictiona ly engage a strip of aper or other flexible material, a ratchet for intermittentl moving said members and having a cylindrical portion and a pair of shoulders, a gear, a pawl carried by said ear for engagement with one of said shoulders, a rack disposed in intermeshing engagement with said gear, a crank for reciprocating said rack with an accelerating and deceleratin rate of movement at the commencement an conclusion of each stroke thereof, a yieldable stop adapted to be engaged by the other of said shoulders and to arrest the rotation of said ratchet at the conclusion of each actuation thereof, and a roller detent mounted for engagement with the cylindrical portion of said ratchet to prevent the backward rotation thereof upon the return or inactive stroke of said rack.

2. In a paper feeding mechanism, the combination of a plurality of members adapted to frictionally engage a strip of paper or other flexible material, a ratchet for intermittently moving said members and having a cylindrical peripher and a pair of shoulders extending there mm, a gear, a pawl operatively connected to said gear for engagement with one of said shoulders, a rack disposed in intermeshing engagement with said gear, means for reciprocating said rack to rotate said gear and pawl first in one direction and then in the opposite direction, said pawl engaging one of said shoulders upon rotation of said gear in one direction and disengaging said shoulder upon rotation in the opposite direction, a yieldable stop adapted to be engaged by the other of said shoulders at the conclusion of each actuation of said rack, and a roller detent mounted for engagement with the cylindrical portion of said ratchet and adapted to engage and lock the same to prevent reverse rotation thereof at any time, said ratchet being locked against movement in any direction between said yieldable stop and said roller detent upon and durin disengagement from said pawl.

3. I n a paper feeding mechanism, the combination with a plurality of rotatable members adapted to frictionally engage a strip of paper; of a drive means, reciprocating means operated by the drive means, a ratchet connected to one of the rotatable members, means operatively connecting said reciprocating means to said ratchet to intermittently drive the same in one direction of rotation, at. depressible stop member engaging portions of said ratchet substantially at the end of each intermittent rotation thereof, said stop member resiliently resisting the rotation of said ratchet and imparting a retrograde loading on the ratchet between intermittent rotations thereof, and a second stop member engaging portions of said ratchet to resist retrograde movement thereof.

4. In a paper feeding mechanism, the combination with a plurality of rotatable members adapted to frictionally engage a strip of paper, of a drive means, reciprocating means operated by the drive means, a ratchet connected to one of the rotatable members, means operatively connecting said reciproeating means to said ratchet whereby said a ratchet is intermittently driven thereby in one direction of rotation, a shoulder on said ratchet, a pawl engaged by said shoulder and de ressed thereby at the end of each intermittent rotation of the ratchet, resilient means on said pawl for resisting the depression thereof, said pawl and resilient means cooperating to resist the rotation of said ratchet and to impart a retrograde loading ment thereof.

EDWARD W. SIBLEY.