US1183380A - Mechanical movement. - Google Patents

Description

G. H. HOLDT.

MECHANICAL MOVEMENT.

mwucmou FILED APR. 21. 1914.

Patented May 16, 1916.

//V [/5 IV TOR 3 SHEETSSHEET I.

mil-III.

} WITNESSES THE COLUMBIA PLANOGRAPH c0. WASHINGTON, D. c.

G. H. HOLDT.

MECHANICAL MOVEMENT.

APPLICATION FILED APR. 21, 1914.

l ,1 83,380. Patented May 16, 1916.

3 SHEETS-SHEET 2.

THE COLUMBIA PLANOORAPH 310., WASHINGTON, p. C.

G. H. HOLDT.

MECHANICAL MOVEMENT.

APPLICATION FILED APR. 21, 1914.

1 18 38, Patented M 16,1916.

3 SHEE HEET 3- sane GEORGE H. HOLDT, F PEARL RIVER, NEW YORK, ASSIGNOR 'IO DEXTER FOLDER COMPANY, OF PEARL RIVER, NEW YORK, A CORPORATION OF NEW YORK.

MECHANICAL MOVEMENT.

nieaseo.

Specification of Letters Patent.

Patented May 1%, 19115.

App1ication filed. April 21, 191 1. Serial No. 833,382.

To all whom it may concern Be it known thatI, GEORGE H. Honor, a citizen of the United States, and a resident of Pearl River, in the county of Rockland 5 and State of New York, have invented certain new and useful Improvements in Mechanical Movements, of which the following is a full and clear specification.

The present invention relates to improvements in mechanical movements of the intermittent grip or clutch type in which relatively movable driving and driven members are connectedby frictional disks.

The primary object of the invention is to provide an improved construction, combination andarrangement of parts with a view to simplifying the construction and reducing the number of parts .and thereby providing a mechanism which will be more durable and efficient.

While my invention may be applied to various mechanisms, it is peculiarly serviceable in connection with a power operated paper cutting machine in which a clamp is periodically operated to apply pressure to a pile of sheets during the active stroke of the mechanism produced by frictional engagement between two sets of friction disks, one set'of said disks being keyed to a power transmission shaft, while the other set of said disks is connected preferably by a ratchet mechanism with a member which receives power from any suitable source. In this connection, simple and efficient means are provided for relieving the pressure due to friction, during the return or inactive stroke, thus avoiding an unnecessary consumption of power and the removal of strain when the clamp is moved away from the pile of sheets.

In the drawings which show the preferred embodiment of my invention,Figure 1 is a fragmentary side elevation of a paper cutting machine having my improvements applied thereto; Fig. 2 is a view atright angles to Fig. 1 partly in-elevation and partly in section, showing portions of Fig. 1 on an enlarged scale; Fig. 3 is a section on the line I1I1IT, Fig. 2, and Fig.

41 is a fragmentary section on the line IVIV, Fig. 2, looking in the direction of the arrow, a portion of the disk 15 being shown in elevation from the left according to Fig. 2.

Referring more particularly to the drawings, in the preferred embodiment shown in the drawings, a crank arm 1 which is keyed to a shaft 1, receives its power from a mechanical train (not shown) and is pivotally connected at 2 with a link 3 pivoted at its upper end 1 to a reciprocating rack bar 5. The rack bar 5 is formed with inwardly presented guide flanges (not shown) which engage and operate upon the channel track bar 6 which is secured to one of the side frames of a cutting machine in suitable position to present the rack bar 5 with its teeth in mesh with the teeth 7 formed on the outer and lower peripheral wall of a housing 8. Said housing is provided with a web portion 9 and a hub portion 10, said hub portion being journaled upon the hub portion 11 of a segmental gear 12 which is keyed to a shaft 13 by means of a spline or feather 11. A plurality of friction disks or flanges 15 are mounted on the shaft 18 and forced to rotate therewith by engagement with the spline 1 1. The hubs of said disks or flanges are providedwith laterally projecting portions 16 which are spaced apart to permit the axial adjustment for regulating the pressure between said disks or flanges. Said hub portions constitute raceways for a plurality of rollers 17 upon which arejournaled other friction disks 18 between which and the friction disks 15 are interposed annular washers or flanges 19 which may be constructed of any suitable material, such as leather for developing the required degree of driving friction, while at the same time permitting relative sliding between the flanges 15 and 18 after the completion of the clamping movement. The peripheries of the disks 18 are provided with ratchet teeth 20 which cooperate with suitable pawls 21 which are journaled on pins or bolts 22 carried .bythehousing 9. From an inspection ofFigub, it will be seen that the pawls on each pin or bolt are of different lengths. be noted that in the present embodiment the pins or bolts 22 are suitably disposed with respect to the disks 18 so that there will always be two out of the six pawls which en- Furthermore, it will gage the teeth 20 and these two will be on different pins or bolts. Thus according to Fig. 3, the rear pawl in the right hand pair is in engagement with a ratchet tooth while the front pawl is about one third tooth pitch away from the tooth. In the central pair of pawls, the nearer one is in engagement with a tooth while the pawl behind it is a third of the way down the next tooth. In the left hand pair the near pawl is one-third and the far pawl is two-thirds down the next tooth. It will be seen therefore that at no time will the housing be moved in an anti-clockwise direction for more than one third of the tooth pitch before two pawls positively engage ratchet teeth. This construction therefore insures an even connection between the housing and the friction disks 18, and also serves to eliminate lost motion. Suitable and eilicient means for regulating the pressure between the disks 15 and 18 may be provided by the sleeve 25 which is slidable lengthwise along the shaft 13 under the pressure developed by a nut 24 which is threaded to the outer end" of the shaft 13. The sleeve 23 constitutes a bearing for the shaft 13 within the hub 25 of the bracket 26. At the same time it constitutes a bearing journaled for the hub 27 which is connected by a web 28 with a peripheral flange 29, which is secured to and constitutes a part of the housing 9, being secured thereto by the bolts 22.

The operation of the improved mechanical movement will be understood from this description in connection with a paper cutting machine. Thus the crank arm 1 is rotated whenever the main clutch of the paper cutting machine is thrown into action by the operator. As said shaft rotates it moves the rack 5 upwardly by means of the crank arm 1, causing the gear case 8 to be rotated by means of teeth 7. As the gear case 8 starts to rotate around the friction disks, the pawls 21 are thrown into engagement with the ratchet teeth 20, thus serving to rotate the friction disks 18 on the rollers 17 However, the friction between the disks 15 and 18 will cause this movement to be transmitted to the shaft 13 and gear or segment 12, which is geared to a rack 30 on the lower end of a rod 31, which transmits power to the paper clamp hereinbefore referred to. The clamp will thus be brought down upon a pile of sheets upon the table. When the resistance offered by the pile of sheets becomes sulficient to overcome the frictional hold between the disks 15 and 18, said disks will slip relatively to each other. After the out has been made, the crank arm 1 by completing its revolution, draws the rack bar 5 clownwardly, thus reversing the movement of the housing 8. On the return movement, the pawls 21 will permit the return movement without moving the disks 18. In order,

however, to effect a reverse movement of the clamp to release the sheets on the table, a lug 32 is secured to the inner wall of the housing 8 and extends into an annular slot or recess 33 in one of the disks 15, the ends of said recess providing spaced shoulders by the lug or projection 32. At the end of the return movement, the shaft and clamp are thus returned to their normal inactive position. The machine is thus relieved of the power that would otherwise be required for overcoming the frictional resistance between the disks 15 and 18 on the return movement, by obviating the relative movement between said disks.

I claim: 7

1. A mechanical movement comprising relatively movable friction disks, an oscillatable housing therefor, one 'of said disks being provided with spaced shoulders, a lug carried by said housing to alternately engage said shoulders to provide limited relative oscillatory movements between said housing and one of said disks, and means other than said lug and shoulders for effecting a positive engagement between said disk and housing during the movement of said housing in one direction.

2. The combination with a shaft, a friction disk keyed thereto, a second friction disk frictionally engaging the first said disk, one of said disks being provided with an arcuate recess, a housing for said disks oscillatable about the common axis of said disks, a positive driving connection between said housing and said second disk in one direction only, and a lug mounted on said housing, said lug being brought into positive engagement with the end walls of said arcuate recess in the extreme relative positions of said housing and disk.

3. In a mechanical movement, a power transmission shaft, a gear keyed thereto and having a laterally extending hub portion, a sleeve movable axially along said shaft, a rotatable housing having spaced hub portions journaled on said hub portion of the gear and said sleeve respectively, friction disks splined to said shaft and adapted to be forced together by the movement of said sleeve, said disks having spaced hub portions providing a raceway, rollers mounted on said raceway, a friction disk journaled on said rollers and having its opposite walls respectively engaging said friction disks, a ratchet mechanism connecting the last said disk with said housing, and a lost motion connection between said housing and one of the first said disks.

4. The combination with a shaft, of a plurality of friction disks movable axially of said shaft but forced to rotate therewith, said disks being provided with laterally extending hubs spaced from each other to allow for axial adjustment, a plurality of bearing rollers bridging the space between and lost motion means for returning the said hubs, other friction disks journaled' on shaft to initial position. said rollers and adapted to be engaged by the first mentioned disks, a rotatable housing GEORGE HOLDT' 5 for said disks, a ratchet connection for trans Witnesses:

mitting motion from said other friction E. R. LYMAN,

disks to said housing in one direction only, F. S. COOPER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

Images