US2248043A - Protective device for web register control mechanism - Google Patents

Description

y 3, 1941- J. DEGNAN w 2,248,043

PROTECTIVE DEVICE FUR WEB REGISTER CONTROL MECHANIS Filed May 26, 1937 I INVENTOR. .kzme: Rynan,

BY :14 W 1 JV Patented July 8, 1941 PROTECTIVE DEVICE FOR WEB REGISTER CONTROL. MECHANISM J amcs Degnan, Corona, Long Island, N. Y., assignor to Speedry Gravure Corporation, New York, N. Y., a corporation oi. New York Application May 26, 1937, Serial No. 144,817

1 Claim.

The present invention relates to mechanism for controlling registration of a web upon which a printing operation takes places and embodies, more specifically, a protective device by means of which such'web register control mechanisms may be rendered inoperative in the event of a break of the web during operation. 1

In applicant's copending application Serial No.

128,888, filed April 4, 1937, now Patent No. 2,105,185, granted January 11, 1938, for "Web registering mechanism, there is described a mechanism by means of which proper registra tion is effected of a web upon which printing operations take place. This mechanism utilizes a photoelectric cell which is exposed to the moving web and, when a dark spot on the web moves past the cell, causes lamps to be energized to indicate when the web is out of registry and whether the web is leading or lagging in time phase to the proper operation. Compensation for leading or lagging conditions of the web is accomplished through adjustment of a web tensioning roller which operates in responsev to the control operations of the web register controlling mechanism.

Upon occurrence of a break. in the paper web with the web registering indicia positioned before the photoelectric cell of the web register controlling mechanism, the web tensioning or compensating roller is actuated to its limit position,' before the presses can be' shut down and the web register controlling mechanism rendered inoperative. This condition necessitates laborious readjustment of the compensating roller to its proper' position with relation to the web and printing rollers before the presses can be put back into operation. The present invention contemplates the provision 'of means by which the web register controlling mechanism may be rendered inoperative immediately upon a breaking of the web.

An object of the present invention is to provide a protective mechanism by means of which web registry indications may be given to indicate the condition oi registry of the moving web, the indicating means and web tensioning means for such mechanism being disconnected in the event of a paper break during operation.

A further object of the invention is to provide a protective device in combination with a web registry indicating and control mechanism, wherein the circuit of the indicating and control mechanism is deenergized by an auxiliary circuit which is actuated upon the occurrence of a paper break during operation.

Further objects of the invention will be apparent as it is described in greater detail in connection with the accompanying drawing, in which the single figure is a diagrammatic illustration of a mechanism constructed in accordance with the present invention.

Referring to the drawing, the moving web, upon which printing operations take place is illustrated at II, this web being controlled and driven, in accordance with current practice and by mechanism which it is unnecessary to describe in detail herein. For purposes of registration, this web is provided with an indexing indicia illustrated at H, such indicia being applied to the web preferably during the first printing operation which takes place upon a given side of the web. In order to control the registration of the web, and in accordance with applicants copending application Serial No.- 128,888, new Patent No. 2,105,185, a photoelectric cell 34 is positioned in order that it may be affected by movement of the indicia ll past it. The circuit of this photoelectric cell consists of a Wire 35 which connects the cell to the, grid of a thyratron tube 36 of the type known in the trade as type 112A. The other terminal of the ce1l 34 is connected to the filament of the tube 36 by means of a wire-31 and through resistances 38 and 39'. In a typical tube circuit,.resistance 38 is of 6000 ohms while resistance 39 is of 600 ohms. I

The filament circuit of the tube 36 includes wires 40, 4| and 42,'a resistance 43 being connected in the wire 40 and a lamp 44 in the wire 42. In the typical circuit above referred to, the resistance 43 is of ohms and the lamp. 44 is of 25-watt '-volt rating. The terminals of wires 40 and 4| are connected to a 110-volt source of current. v

A resistance 45 is connected between wires-31 and 4| by means of a wire 46. In the typical circuit above referred to, resistance 45 is of 4000 ohms.

The plate circuit of the tube 36 includes wires 41 and 48, wire 48 being connected to wire 42 and lamp 44. A condenser 49 is connected across the plate circuit by means of a wire 50, the condenser having a rating of one microfarad in the typical circuit above referred to.

A relay 5| is connected in the. plate circuit, this relay having a contactor 52 which is adapted to engage terminals 53 and 54. Terminal 53 is connected to one side of a suitable power source by means of'a wire 55 while terminal 54 is connected to a circuit interruptor 26 by means of a wire 56, The interruptor 26 is adapted to enthe printing press a suitable fashion.

' is connected in the -thewi-resllorli,asa'

gage 'a stationary contact to a contact flngerjl. The interruptor 28 is operated by means of a cam 2i whichis mounted on or synchronized with the rotation of the drive shaft which operates the press.

Contactfinger ll engages a continuous .contact ring 2! which is carried by a drum directional switch-21. The drum switch 21 is mounted upon a shaft which is either the drive shaft of or else is driven thereby in II which is connected through almost on -half of the periphery of the drum 21, and a contact :segment 30 which likewise extends throughout almost one-half of the periphery of the drum side thereof from the segment 29.

V The drum switch 21 is provided with a contact segment. which extends 21, but upon the other Contact fingers l2 and Il engage the respective segments 2! and 30, these segments being connected to the continuous ring 2|. .Contact finger 32 is, connected to a wire 58 which is connected in turn to a wire 59, connected to the opposite terminal of the source of power with which wire II is connected, while contact finger II is connected to a wire it which is also connected nectedin the circuit of wire I. while a lamp circuit of wire I. As described in the applicant's above identifled patent, the foregoing structure serves to indicatelach of registration. the web is leading and the indicia ll reaches the photoelectric cell 34 before interrupter 26 is operated by cam ll, the current generated by cell it closes relay II and current flows through wires and It and through the various switch contacts to energize the proper one of the lamps BI and II. In'order to compensate for leading or lagging conditions of the web, a webtensioning roller is provided with a reversible motor ope'ratively connected with the webregister controlling device, the motor being controlled by any suitable reversing mechanism which is operated by relays responsive to current flowing through resultof out-of-phase.

The motor operates roller to properly ten- For example, when registration of the web; upon the web tensioning sion the web to place the web registering indicia in registration with the photoelectric cell It, whereupon the circuit includin the signal lamps J0 and ti and the electric motor is deenergized.

to wire N. Alamp N is connamed means,

circuits, means in both of said circuits for ad- As above described, whena paper break occurs and the web registering indicia rests before the photoelectric cell II, the cell 34 generates a con,- tinuous current which maintains: thev relay 5| closed. and thus causes a sustained current to flow through theneon lamps 0| and 02, also effecting movement of-the web ;.tensioning roller to its limit position.

i In order to "prevent continued operation of the web registering and controlling mechanism under the above described conditions, asecond photo- V which, when the relay .wire 56.

electric cell 34' wires 35' and 31'. Wire 35' iii/connected to the grid of a thyratron tube nectedto the filament of such tube through resistances 38' and 39'. The filament is also connected to a wire. 40* through a-resistance 43'. The filament is also connected to wiresjll' and 42' in order that it may be connected-across a power circuit of suitable character. A lamp 44' is connected in the wire 42' and a resistance 45' is connected between wires 31' and ll by means of awire 48'.

The plate of'the tube 36' is connected to wire ll by means of wires 41' and 48', these wires including a relay 5|. nected across the plate circuit by means of a wire 50', the foregoing circuits being similar to the above described circuit of photoelectric cell Relay 5| is provided with'a contactor 52'. 5| is energized, is adapted to close the circuit across terminals 53' These terminals are connected in the circuit of is continuously'de-energized, the relay ii opens the circuit across terminals 53'.and 54',- thus opening the circuit including the lamps Stand 62 and the wires '58 and ii, preventing opera:

tion of the web register controlling mechanism tensioning roller to its limit to actuate the web position.

Relay 5| is provided which is adapted to engage terminals II and 82, connected in the circuit 83 of the motor which operates the press In this fashion, operation of the press stops when a paper break O ccurs.

While the invention has been described'with 1 reference to the specific construction shown in the accompanying drawing, it is not to be limited save as defined in the accompanying claim.

Ic'laim: 7 Web control mechanism for printing 'presses having a plurality of printing cylinders comprising means responsive to predetermined portions of a. web, a plurality of electro-responsive means,

a signal lamp in each of said vancing or retarding said web, rotary means in timed relation to said cylinders for making a connection to'the circuits alternately and at regular intervals, means actuated by the means responsive to the predetermined portions 'of the web for controlling said circuits, 9. photoelectric cell responsive to the absence of: said web, and means controlled by said photoelectric cell-for interrupting said circuits to render said signal lamps and the means for retarding "and advancing said web ineffective. V

. JAMES DEGNAN.

is provided, being connected to 36' while wire 31' is con-' Condenser I9 is conand it".

When the web breaks and the cell 34' with a second contactor electric circuits for each of said last-

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