US2313888A

US2313888A - Stop mechanism for web feed

Info

Publication number: US2313888A
Application number: US385997A
Authority: US
Inventors: Erial B Otis
Original assignee: WALLACE PRESS
Current assignee: WALLACE PRESS
Priority date: 1941-03-31
Filing date: 1941-03-31
Publication date: 1943-03-16
Anticipated expiration: 1960-03-16

Description

March 16, 1943. E. Bfofls 2,313,888

STOP MECHANISM FOR WEB FEED Filed March 31, 194i 2 Sheets-Sheet 1 March 16, 1943. E. a. OTIS STOP MECHANISM FOR WEB FEED Filed March 81, 1941 2 Sheets-Sheet 2 Patented Mar. 16, 1943 OFFICE STOP MECHANISM FOR WEB FEED Erial n Otis, Chicago, nl., assignor to The Wallace Press, Chicago, 111., a corporation of II- linois Application March 31, 1941, Serial No. 385,997

3 Claims.

This invention relates to ty-pewriting and printing machines, motor driven and more or less automatic in operation, particularly manifolding machines employing long webs made up of successive forms that are fed to the machine by pin-type feed devices engaging perforated feed bands onthe margins of the webs.

The main object of this invention is to provide an improved form of stop mechanism for automatically stopping the machine when the feed of the paper web is interrupted by breakage of the web or by an obstruction to the web feed and before the'operating mechanism can be injured by excessive strain.

A specific embodiment of this invention is shown in the accompanying drawings, in which:

Figure 1 is a perspective view of the web feeding and stop mechanism mounted on an automatic typewriting machine, the latter being for the most part broken away.

Fig. 2 is a section of the manifolding web feeding mechanism taken on the line 2-2 of Fig. 1.

Fig. 3' is a sectional detail taken on the line 3-3 of Fig. 1.

Fig. 4 is a detail of a gear train with some related parts shown in section, taken on the lin 4-4 of Fig. 1. I

Fig. 5 is a detail of a portion of the pin-type feed mechanism illustrating a possible entanglement of the manifold web that, might occur if one or more of the sheets happens to be torn.

Fig. 6 is a detail of the mechanism that con-f trols the stopping of the machine when the manifold web becomes jammed.

Fig. 7 is a sectional detail of the same showing a suitable form of trip mechanism in its normal driving position.

Fig. 8 is a similar detail showing the same parts in position for actuating the stop switch.

In the form shown in the drawings, the machine, represented generally by the numeral 10, is driven by an electric motor II and may be of a well-known type in which the printing mechanism is controlled by punched control cards in which apertures 'in the card are employed for actuating automatic mechanisms of the machine to print corresponding information upon the manifold forms by means of type members that rise through the opening [2 and, cooperate with a platen l3. For the sake of simplicity of the drawing, these type members are not shown, since I4 is depressed, the machine will instantly stop.

The web feeding mechanism comprises a lower feed bed made up of spaced generally parallel iplates l5 along which the manifolding web I 6 is fed to the platen l3. The web then passes between the platen and the paper guide rollers I! and then over an upper feed bed comprising spaced guide plates l8 from which it is fed in the direction of the arrow l3 to a suitable conveyor or magazine, not shown.

The supporting framework for this paper feed mechanism comprises

side frame members

20 and 2| connected by transverse rods and

bars

22, 23, 24 and 25. The middle set of guide plates l8 and I5 are fixed. in position on said rods and bars. The right hand and left-hand paper feed assemblages are each slidable as a unit and are relatively adjustable to suit any desired width and position of the manifold webs.

In the form shown, the feed pins 26 in each such assemblage are carried by an endless belt 21 mounted on a pair of

sprockets

28 and 23 as appears from Fig. 2. The idle sprockets 28 are carried by spindles 30 and the driven sprockets 29 are carried by the squared drive shaft 3|.

Each of the pin-feed assemblages comprises a pair of side plates 32 between which the sprock ets 28 and 29 and their belts 21 are mounted and these plates 32 are rigidly attached to the respective one of the guide plates l8 of the upper feed bed. These assemblages are supported by This guide plate 35 is located a suflicient distance below the feed belt 2'! to be clear of the pins 26 on the lower flight of the belt. The upper plate I8 is, however, located so that the feed pins 26 will project through a slot 36 into engagement with the pin holes in the manifolding webs.

A guide shoe 3'! is hinged to one of the check plates 32 in each feed assemblage and is shiftable on its hinges into and out of position for engaging the feed bands of the paper webs as shown in Figs. 2 and 1 respectively. The shoe 31 is slotted at 38 to accommodate the movement of the pins "26 throughout that part of their path during which they engage the paper web.

A clutch 40 connects two sections of the drive shaft 3! so that the two feed belts may be adjusted relatively to each other for proper engagement with the perforations of the respective feed bands of the manifolding webs.

The gear train, illustrated in Fig. 4, connects the squared drive shaft 3| with a gear 4| on the spindle 42 of the platen roller, so that the pinfeed devices will be driven in exact timed relation to the platen.

Gear 44 is-loosely mountedon a reduced cylindrical end portion 45 of the shaft 3| and has an integral clutch member 48 on one side that coacts with a clutch member 41 fixed on shaft 3!. One of these clutch members has an arcuate de-- pression 48 to receive a correspondingly formed cam projection 49 on the other.

A ball bearing 50 for the cylindrical end 45 of the shaft 3i is mounted in a bearing cup 5| attached to the side frame 20 in position to be engaged by a hub extension 52 of the gear 44 on one side and by a shiftable plate 58 on the other side. This shiftable plate 53 is slidably mounted on a pair of studs 54 which carry a head 55 in which is seated a compression spring 56 which normally urges the plate 53 toward the left, of

4 Figs. '7 and 8, and thus indirectly holds the

clutch elements

58 and 49 in normal engagement as in Fig. 7. An adjusting screw 51 is threaded in the head 55 and carries a lock nut 58 whereby the tension of the spring 56 may be adjustedto adjust the driving strain limit for the paper feed.

The plate 53 carries an arm 59 which extends into the housing. of a quick-throw electrical switch, indicated at 6|, which may be of any appropriate constructionfor being actuated by very slight movement of arm 59. In the form shown, the contact. elements of the switch are housed in an insulated casing from which an operating stud 62 projects into contact with the spring arm 63 which extends in a position to be engaged by the arm 59.

A two-wire electric cord 64 connects the switch contacts with an electromagnetic motor or relay 65, Fig.3, which comprises a magnet 66, an armature arm 61 which is pivoted at 68, and has a finger that extends across the top of the ma chine stop key M. A compression spring 10 nor mally holds the finger 69 released from the key l4 and a stop pin H on the arm 81 adjustably limits the throw of the arm 61 under the action of compression spring 10. A button 12 operates the switch 13 which connects the operating circuit oi the relay with a power line, indicated by terminals 14.

A second two-wire conductor cord 15 connects the relay 65 with a second stop switch 18 which is positioned and arranged to stop the machine Ill when a break in the paper webbing occurs. These

conductor cords

64 and 15 are connected together and to a line cord 1'! so that either or both will actuate the relay.

Preferably the safety key I4 is arranged so that the machine In can operate only when said key i 4 is elevated and the arm 69 with its relay is so arranged as to hold said key l4 depressed whenever current is supplied to the relay by closing stop The switch is closed when the parts'of its respective operating mechanism are in the relative positions shown in Fig. 7, and is open when they are in the positions shown in Fig. 8.

Similarly the switch 16 is normally closed when its operating mechanism is in the position in which it is shown in Fig. 2. In ths arrangement the switch pin 11 of the switch I6 is actuated by an arm II pivoted at 19 and carrying at its end a roller 80 that rides on the under side of the" manifold. web i6 and the shield or web guide plate 35 is provided with an aperture 8| in registering position with the roller 80.

The arm 18 is normally urged across the path of the webbing, either by a spring that normally urges the switch pin 11 outwardly from its casing 16 or by a spring coiled around a pivot pin 19 as is apparent without illustration.

In operation the superimposed webs of manifold paper'with their interleaved carbons are threaded through the machine in the manner illustrated in Fig. 2 so that the pins 26 of the feed mechanism register with perforated feed bands of the manifold webs and draw the webbing around the platen where it is printed upon and advanced by intermittent feeding operations in synchronism with the movements of the platen roller l3.

If a breakage occurs in the webbing or the end of the webbing arrives at a point past the roller 80, saidroller will rise through the opening 8| and close the relay circuit by means of the switch 16 which will actuate the stop key M so as to stop the machine.

Similarly, if the manifolding web becomes torn or buckled so as to ofier unusual resistance to the feeding thereof by means of the pin band mechanism, this resistance will be transmitted to the shaft 3| and will permit the feed gear 44 to ride out of its clutching engagement with the clutch member 41, as illustrated in Big. 8.

The camming action of the

opposed clutching surfaces

49 and 48 will shift the gear 44 to the right of Fig. 8 and cause the shifting of the finger 58 so as to close the circuit at the switch GI and actuate the relay to stop the machine.

It is obvious that a normally closed electric circuit may be used for controlling the stop mechanism in place of the normally open circuit that has been herein described. In such case the stop switches 6i and 16 would be connected in series with each other at the connector 80.

Although but one specific form and arrangement of each of the features of this invention is herein shown and described, it'will be understood that numerous details of the construction shown may be altered or omitted without departing switches BI and I6 and said switches are closed.

from the spirit of this invention as defined by the following claims. I

I claim:

1. A printing machine with platen feed having a key for operating its control mechanism, in combination with an auxiliary paper feed device having electromagnetic means for shifting said key, and a safety switch controlled by the paper in said auxiliary feed device for actuating said electromagnetic means.

2. The combination with an automatic typewriting machine having a platen feed and provided with a shiftable key for operating its control mechanism, of a manifold web feeding mechanism having means for feeding a manifolding web to and from the platen, an electromagnetic motor associated with and having means arranged to actuate the shiftable key to stop the printing machine when the electromagnetic motor is operated, a switch electrically connected with the motor and located adjacent the webfeeding mechanism, and means carried by the web feeding mechanism and responsive to breakage of the web for actuating the switch to operate said motor to stop the'machine in event of break- 'a geofthe paper andwhenthereisnopapcrto be written upon. v

3. The combination with an automatic typewriting machine having a platen feed and provided with a shiftahle key for operating its control mechanism, of a manifold web feeding mechanism having means for feeding a nianifoiding web to and from the platen, an tic motor associated with and having means arranged to actuate the shiftable key to stop the printing machine when the el motor is operated, a switch electrically connected with said motor' and located adjacent the means for actuating the web feeding mechanism, and

a clutch incorporated in said actuating means and responsive to increase in resistance to the movement of said web for actuating the switch to operate said motor and stop the typewriting machine in event of'iamming of the paper through accidental defects in the paper whereby injury to the delicate mechanism of a type- 10 writing machine is prevented.

mun B. o'ns.