US1483101A - Copyholder - Google Patents

Description

Feb

A. S. MCDOWELL COPYHOLDER Filer; may 11.` 1922 esmassheet 1 Mea/15% ATTORNEY N V EN TOR.

Patented Feb. 12, 1924.

Nitiw s. i'vIA'cIowELL, or ROCHESTER, New' YORK.

corYHoLnEn,

ap15in-,atri'nfinedy May 11, 1,922. seriai No. 560,047.'

Y.TofaZZ `whom 1may concern.'

Be it known thatfl, ANDREW S. MAC- DOWELL, a citizen 'of the United States of vAmerica, ,residing iat .Rochesten f, in the 5 county of Monroeand State of New York,

have Yinvented .certain new :and useful Iml rovements .in HCopyhold'ers, of vwhich the cllowing isa:spi'eci'.-lijcation.V i

.My :invention .relatesto fcopyholders, .be-

inig'fan ,improvement f on kthe Vconstruction which forms the :subject-matter of ymy .coypending iapplication"filed March 27, T1920, -Serial'No;69,431,-'and has for its purpose to provide Ava #practicable Land eflicient electrically operated rmechf'nrsm lfor the type of copyholder vin-whicha Lcopy support is mov` able upwardly or. downwardly, supporting copy ina vertical plane, and is controlled by a reversible electric motor in such a manner asnto `drive the lcopy support vpositively. ineither direction. 'Aiurther object of the improvement. is toprovide vsimple and eii'ective means 'for automatically stoppingtthe electric motor 26 when Vthewcopy support reaches kthe limit ofrits `travel in either direction, it ybeing understood that the motor 'is started to move thecopy vsupport "in `reither direction by amanually controlled switch key.

Another .object o'ithewinvention ,is to ef lectively cushion .the fally of the copy support .as lit-reaches :thelimit of its downvward travel, andto accomplish this by auto- 'imaticallyfreversing the relectric motor, thus -causingiitfto act 'as-abrake'zupon the 'copy support. i

Still another purpose `of my invention visto alford anarrangementofelectric circuits and automatic controlling switches 40 such that whenfthefcopy ,support reaches the li-mitot itsdovvnw-ardtravel, if moving at `.considerable1"speed,` iit r'automatically lis reversedizandtravelsvupwardly slightly be'- iore',pitfcomesgtoxrest;

I( 'To kthies'e zand; other ends'fthe invention -includefsf` the :novel 'l'.coinloinationy and :arrangementffo'f -partszfthat v:willappearclear ly 'from the following description, lin conjunction with the 'accompanying 2 drawings, the novel ieaturesrbeing. pointdefout in `the' claims Efoliowingethicispiaciitattion;

spring `11 In the drawings:

Figure 1 is `a rear elevation, partially brokenv away, showing the application of a preferred embodiment of the invention;

Figure 2 is a side elevation;

Figure 3 is an enlarged iront elevation of a yportion of the apparatus, illustrating the zeuitomatic controlling switches Figure 4 is a front elevation, partially broken away, of the switch board, illustratthe circuit arrangement;

Figure 5, vis a sectional view on line 5-,5 ofFigure 4;

Figure ,6 is a electric circuits;

Figure 7 is a sectional view on line7-7 of Figure 1, showing a switch in normal or uppermost position, and

Figure 8 is a vdetail View of a portion ofA the structure illustrated in Figure 7 and illustrating the vswitch in its lowermost position.

In the illustrated embodiment, 1 designates in general ka stationary frame upon which is mounted for upward and downward travely a copy support 2, the latter bein-g operated from a reversible electric diagrammatic yview of the fm'otor 3 by a suitable manual switch or switches, such lfor instance as illustrated in co-pending application previously refer-red to, `and as shown diagrammatically in ,Figure 6.

The motor '3 is provided `with a worm 4 on its armature shaft, which engages and drives a gear 5. The gear 5 is mounted on a driven member or arbor 6, which cooplerates withand actuates a flexible connection leading to the copy support. To accomplish this, there is on the arbor 6 a pinion 7 which engages a chain 8, while the latter engages a pinion 9 journalled on the frame 1, and has oneend directly con'- :nectedv to the copyfsupport through a "lug f101iXed thereon. The other `end ofthe chain 8 is connectedto a spring11, which in turn-is connected to the lug '10, the rfunctioning to take up any slack inthe @chain 8, and to hold the same suiiiciently taut -to leffect a steady, accurate movement of the copy support.v Vf

It is desirable to automatically-*stop the #bring it into contact with yexcessive downward two tracks of one set.

motor 3 when the copy support reaches the limit of its upward or downward travel, and to accomplish this I provide the chain 8 with abutments preferably in the form of lugs 12, which cooperate with and move alternately a pair of switches designated generally at 13 and 14, the switch 13 acting to open the motor circuit when the copy support reaches the 'limit of its downward travel, and the switch 14 acting to ope-n the motor circuit when the copy support' reaches the limit of its upward travel. n

The switches 13 and 14 are held upwardly in normal position by means of springs 15, which cooperate with supports 16 on which the switches are mounted. The supports 16 are slidable on posts 17, and have arms or extensions 18 which lie in the-path of the lugs 12, as one or the other of said lugs travels downwardly, depending upon the direction of movement o1 the copy support.

The switch 14 comprises a contact mem- .ber that engages and slides upon a pair of tracks or strips, which include conducting Aportions 19 and non-conducting or insulating portions 20, so that when the switch 14 moves downwardly far enough to disengage it from the conducting portions 19, and

the non-conducting portions 20, the circuit is automatically opened. The switch 13 cooperatesA similarly with conducting'tracks whenv the copyy support reaches the limit of itsl downward travel, but at such time, it is also desirable to cushion the fall of the copy support, and to this end, I have provided additional ymeans for reversing the electric motor, and

thereby causingit to act as a brake against movement of the copy support. This is accomplished by providing two sets of tracks for the switch 13 with three tracks in each set, as shown in Figures 4 and 5, the switch including two oppositely arranged conducting portions insulated from each other at the center, and each of said conducting portions acting to connect The switch is located normally at its uppermost position and in contact with conducting portions 21 and 22. As the switch travels downwardly, it comes into contact with insulated portions 23, thereby opening the motor circuit, and on further downward travel of the copy support, Vdue to its momentum and weight, lthe switch is brought into engagement with conducting portions 24 and 25, thereby again closing the circuit, but in such a manner as to reverse the direction of travel of current through the armature of the motor. This action causes the copy support to commence to travel upwardly until the switch again reaches the insulated portions 23, when the circuit is again opened and the copy support comes to rest.

The circuit control will appear clearly from a consideration of Figure 6, in which 26 designates the manual control switch means for initially closing the motor circuit to operate the copy support either upwardly or downwardly.y When the switch 26 is thrown to the right in Figure 6, 1t closes the circuitandcauses the copyy supportito travel upwardly, current travelling through conductor 27, switch 26, conductor 28, through armature 29 in the direction of the arrow shown in Figure 6, conductor 30, switch 26, conductor 31, conductor track 19, switch 14, conductor track 19, conductor32, motor lield 40, and conductor 41. Thisoperation continuesy until the copy support reaches the limit/of its upward travel, when the switch 14 is moved downwardly, and the motor circuit opened at that point, thereby stopping' further travely of the copy support.

V] hen theswitch 26 is thrown to the left, with reference to Figure 6, the copy support is caused to travel downwardly, currentl travelling through conductor 27, conductor 33, conducting track 24, conducting track 21 to switch 13, to conducting track 22, conductor 34,

to switch'26, to ,conductorr 30,

through armature 29 inl a direction opposite to the arrow of Figure 6, to conductor 28, switch .26, conductor 35, conducting track 22, switch 13, conducting rtrack 21, conducting track 24, conductorr36,..to motor field 40 and conductor 41. Thisoperation continues un- 'r til the switch 13 isinoved downwardly by the copy support reaching its downward position, which initially opens the lmotor circuit and thereafter'again closesithelmotor circuit so as to reverse the travel of the motor, current then travelling through conductor 27, Jconductor 33, conducting track 24, to switch 13, as shown-in dotted lines in Figure 6, to conducting track 25, conductor 37, through armature to conductor 39, conductingtrack 25, switch 13, conducting track 24, conductor 36, motor field 40, and conductor 41'.l With'thewparts in this position, upwardly until the switch 13 is released and the switch 13` moves upwardly until' the switch13` reaches the insulated portions 23, again opening the motor circuit, and' bringing the copy support to rest.y l"

While lhave disclosed the invention with referencel to detailed improvement, it is not limited to they precise arrangement set forth, and this application is' intended to directiony of 29 in the direction of the arrow shownf in Figure 6,

the copy supporttravels cover any modifications or departures coming within the intended purpose of the invention or scope or" ther following claims.

Iclaim:

` 1. The combination with a frame, of a copy support' movable upwardly or downwardly thereon, a reversible driven shaft, Aa

flexible connection operatively associated .2. The combination with a frame, of a.

copy support movable upwardly or downwardly thereon, a driven shaft, a reversible electric motor operating the driven shaft, a flexible connection operatively associated with the driven shaft and having its ends connected to the copy support, a pair of switches controlling said motor and operating to open the motor circuit automatically when the copy support reaches the limit of its upward or downward travel, and devices carried by said flexible connection for moving said switches.

The combination with a frame, of a copy support movable upwardly or downwardly thereon, adriven shaft, a reversible electric motor operating the driven shaft, a flexible connection operatively associated with the driven shaft and having one end connected directly to the copy support, a spring connecting the other end of the ilexible connection with the copy support whereby to take up slack in the flexible connection, a pair of switches controlling` said motor and operating to automatically open the motor circuit when the copy support reaches the limiti of its upward or downward travel, and devices carried by said flexible connection for operating the switches.

4. The combination with a frame, of a copy support movable upwardly or downwardly thereon, a reversible dirven shaft, a pinion on the shaft, a second pinion journalled on the frame, a chain engaging the pinions and having one end directly connected to the copy support, and a spring` connecting the opposite end of the chain with the copy support.

5. The combination with a frame, of a copy support movable upwardly or downwardly thereon, a driven shaft, a reversible electric motor operating said shaft, a pinion on the shaft, a second pinion journalled on the frame, a chain engaging the pinions and having its ends connected to the copy support, a pair of switches controlling the electric motor and operating to automatically open the motor circuit as the copy support reaches the limit of its upward or downward travel, and devices carried by the chain for operating the switches.

6. rPhe combination with a frame, of a copy support movable upwardly or downwardly thereon, a driven shaft, a reversible electric motor operating the shaft, a pinion on the sha-ft, a second pinion journalled on the frame, a chain engaging the rpinions and having one end connected directly to the copy support, a spring connecting the other end of the chain with the copy support, a pair' of'switches controlling the mo: tor and operating to automatically open the motor circuit as the copy support reaches the limitvof its upward or downward travel, and lugs carried by the chain arranged to engage and move said switches as the copy support reaches the limit of its respective movements.

7. The combination with a fra-me, of a copy support movable upwardly or down wardly thereon, a reversible electric motor for actuating the copy support, and a switch which is operated automatically as the copy support reaches the limit of its downward travel, said switch acting initially to open the motor circuit and thereafter to reverse the direction of travel of the motor.

8. ylhe combination with a frame, of a copy support movable upwardly or downifvardly thereon, a reversible electric motor for actuating the copy support, and a switch which is operated automatically to open the motor circuit as the copy support reaches the limit of its downward travel, said switch.

acting automatically to reverse the motor when the copy support travels downwardly beyond the circuit opening position and to move the copy support baclr to circuit opening position.

9. The combination with a frame, of a copy support movable upwardly or downwardly thereon, a reversible electric motor forl actuating the copy support, a driven shaft operated by the motor, a pinion on the shaft, a second pinion journalled on the frame, a chain engaging the pinions and having its ends connected to the copy support, a switch that is operated automatically as the copy support reaches the limit of its downward movement to initially open the motor circuit and thereafter reverse the motor, and a device carried by the chain for engaging and operating the switch.

10. The combination with a frame, of a copy support movable upwardly or downwardly thereon,I a reversible electric motor for actuating the copy support, a motor circuit, and a switch that is automatically operated to open the motor circuit as the copy supporting member reaches the limit of its movement, the motor circuit including a plurality of conducting tracks and the switch comprising a contact member which straddles and is slidable on said tracks.

11. rlhe combination with a frame, of a. copy support movable upwardly or downwardly thereon, a reversible electric motor for actuating the copy support, a motor circuit, and a switch that is automatically operated to open the motor circuit as the copy supporting member reaches ythe limit of its movement, the motor circuit'ncluding a plurality of tracks with conducting portions at the top which cause current .to travel so as to drive the motor 1n one direction, insulated portions beneath said conductmg portions, and conducting portions under the insulated portions causing and is slidable upon said tracks.

In Witness whereof, I have hereunto signed my name.

ANDREW s. MAODOWELL.

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