US1812245A

US1812245A - Safety appliance

Info

Publication number: US1812245A
Application number: US358079A
Authority: US
Inventors: Krell Joseph
Original assignee: Individual
Current assignee: Individual
Priority date: 1928-05-03
Filing date: 1929-04-25
Publication date: 1931-06-30
Anticipated expiration: 1948-06-30

Description

SAFETY APPLIANCE Filed April 25. 1929 J. KRELL 1,812,245

2 Sheets-Sheet 1 In I 4 i 12 13 7 0 6 I 4 14 a r l ri 7/////f IN vew Ta R June 30, 1931. J, KRELL 1,812,245

SAFETY APPLIANCE Filed April 25. 1929 2 Sheets-Sheet 2 1 krel/ lNvNTO/Q Patented June 30, 1931 JOSEPH KRELL, F BERLIN-ZEHLEIN'I'JORYF, GERMANY SA H NF E I I Application filea'n rirzs; 1929, Serial No, 358,039, and in Germany Maya, 1928.

ject of 'my'inventi'on to provide a simpleand 1 reliable's'afety appliance which will notinterfere'with the operation ofthe machine and not require the machine to be stopped.

To this end'I'provide a guard adaptedto 1 0 engage the "fingers of an operator, and I so control this guard that it projects into" the path of the head'when the head is raised,and' is moved out of itspath and toward the operators station when the head descends.

printing head. H I

My novel safety appliance engages with absolute Zreliability any a number of fingers which maybe in the danger zone, and pushes them back so that they are 'not struckby the descending head. At the same time itis not necessary to stop the machine to prevent the head from engaging a finger.

9 In reducing my'invention to practice I provide a guard which in its initialkposition pro jects to a short distance above the table of the machine so as toa dmit a paperor' form on which the machine prints but not 'the oper-' ators fingers, and upon descent of the print- '3 made of rubber'or other resilientmateri'al and is arched on its lower face so that the lower part ofthe arched face approachesthe table of the machine and the guard perform'sa sort of rolling movement with respect to the table,-

40 pushing back the fingers at considerable force.

In a" preferred embodiment of my invention I provide an arm of comparatively short length which is fulcrumed on'the printing head and a link fulcrumed on the frame of the machine and pivotally connected with the arm so that the connection of the link and the arm moves on an arc ofa circle about the fulcrum the link. This fulcrum is: preferably arranged above and a short distanceiin front of thefulcrum of the arm on Preferably theineansjv for controlling the guard are oper'atively connected the the head so that an upwardmovementis im parted to the guard which is attached to the free end "of the arm immediately upon the descent of the printing head.

1 UNITED i It is another object ofmy invention 'to adapt the guard to printing pads of various, widths and .tothis end I provide'means for displacing the fulcrum ofthe link 'on'the frame of the-machine,

It is still another object of my lnvention to renderthe guard inactive whenthemachine 1s cleanedor inspected-and to' this end I provide means for fixing the guard in such inactive'position. I I shall now reference to a machine; having a rocking printing head but it is understood that it may also be applied to a machine'having ahead guided on a' verticalline arid'not on a'gcurve,

printing head is provided with a, printing pad Qas ,will be described, or with type for Printing-l i '1' In the accompanying drawings a machine having a rocking printing head andequipped with my novelsafety appliance is illustrated byway of example, L

In the drawings 'Fig. 1 is'an elevatlon of the machineviewed.

describe invention fwith land ,thatit makes no difl'ereneewhetherzthe I from the front onthe operators station, 33

' Fig. 2 is a: p'lan viewof the machine, the arrow I indicating the direction in which themachine is viewed in Fig. 1, v -Figs. '3 and tare e'nd elevations viewed in the direction of th elarrow IIIin Fig. 2, and showing the? printing head raised and I lowered, respectively, with the controlset for a narrow printing pad, h t

Figs. 5 and6 are similar illustrations showing the control set for a wider printing .pad, Fig. 7 shows the guard in inactive. position,

Fig, 8 is adetail illustration showing the means for fixing the link in inactive position,

and viewed in the direction Fig, .7, 5

andf a Fig. 9 is ardetail illustration, drawntoa larger scaleand showing the means for fixing the guard in inactive position. v a -Referring now to the drawings, 1 is the frame'of'the' machine, 2 is its table, 3 is. a

guideway in the table for feeding printing plates 4 to the printing station, 5 is a supply hopper for the printing plates, 6 is the printing station, 7 is a ribbon moved above the printing plates, 8 is a printing arm pivotally carried on the table 2, 10 is the printing head, 11 is a printing pad on the head, and 11 is a rubber plate on the lower face of the pad 11. Forms or other papers to be printed are placed on top of the ribbon 7 and forced down onto the printing plates 4 by the pad 11.

12 is a. substantially U-shaped bracket having two rearwardly extending arms 12 and secured to the front face of the

printing head

10, 13 is a pivot in each arm, 14 are arms pivoted on the

pivots

13, 15 is a guard secured to the free ends of the

arms

14, 16, Fig. 1, is a curved link which engages one of the arms 14 by a

pivot

14, 16 is a boss at the end of the

link

16, 17 is a pin about which the link is adapted to rock and on which it may be displaced as will be described, 16 is a projection on the boss opposite the

link

16, 17 is a boss at the upper end of an upright 18 which may be secured to the

hopper

5, 19 and 20 are holes in the boss 17 for the reception of the

17, and 21 is a. set screw for holding the pin in the hole 19.

As shown for a. narrow printing pad in Figs. 3 and 4, the pin 17 is inserted in the hole 19, and held by the set screw 21 in which position the pin 17' is at a considerable distance above the pivots 13 of the

arms

14, 14, and some distance in front of such pivots. The effective length of the link 16 is such that with the printing head raised as in Fig. 3 the guard 15 does not depend vertically from the pivots 13 but is moved a little to the front from such vertical position.

Referring now to Figs. 5 and 6 these show the printing head 10 equipped with a wider pad 11a. In this case a bracket 12 is provided in which the pivots 13 are further to the front than in the example illustrated in Figs. 3 and 4 and the pin 17 for the link 16 is inserted in the hole 20 instead of the hole 19, and held by the set screw 21.

The lower face of the guard 15 is arched upwards, and so is its rear end. he radius of the arch is such that when the guard moves from the position Fig. 3 into the position Fig. 4 the vertical clearance between the table 2 and the lowest point of the guard 15 is very small for any position of the guard.

Referring now to Fig. 9, 24 is a bolt in the bracket 12 which is urged out of its bore by a spring 23, and adapted to engage in a hole 25 of one of the arms 14, for an object which will be described.

Before starting for a printing operation the parts are in the position illustrated in Fig. 3 in which the guard 15 hangsdown into the path of the printing head 10. In this position it does not interfere with the introduction of a form or the like but retains the fingers of the operator. When the printing head 10 descends into printing position the guard 15 is moved toward the front and into the position Fig. 4 in which it is moved out of the path of the printing head 10. In this position it permits the pad 11 to engage the form on the ribbon 7. When the printing arm 8 is raised again the guard is returned to the position Fig. 3 by the link 16 and the arms 14. If now the operator upon downward movement of the arm 8 does not remove his fingers out of the path of the printing head 10, as shown in Fig. 3, the guard 15 upon descent of the printing head and as shown in Fig. 4, pushes back the fingers without hurting them as the guard is of resilient material. Nor can the fingers be caught between the guard 15 and the table 2. If desired the guard 15 might be provided with an outwardly curved extension, not shown, which before the guard 15 has completed its outward stroke will assist in pushing back the fingers and still more reliably prevent jamming of the fingers between the guard and the table.

The guard must not interfere with certain operations, such as, for instance,exchanging the pad 11 or 11a inserting anew ribbon 7 etc. Referring to Figs. 7, 8, and9, the link 16 with its boss 16 isdisplaced axially on the pin 17 in the direction 22, 1, until the link has released the pin 14, whereupon the link is thrown over into the position Figs. 7 and 8 and moved in the direction 22 until the end of the boss 16 engages the boss 18 and the projection 16 comes to bear on the top of the boss 18, preventing unintentional returnof the link 16. After the pin 14 has been released by the link 16 the arms 14 of the guard 15 are turned up until the spring catch 24 engages in the hole 25,

holding the guard in the position Fig. 7.

I claim:

1. A safety appliance for address printing or similar printing machines with a printing head moving up and down, for preventing the nipping of the operators fingers by the descending printing head, comprising in combination a protective body, means for hanging the body in the path of the printing head when the printing head is raised, means pivotally suspended from a stationary part of the machine and pivotally connected to the hanging means for controlling the body so that during the down stroke of the printing head the body is rocked forwards, that is towards the person in char e and out of the path of the printing head.

2. A. safety appliance as claimed in claim 1 wherein the means for hanging the body from the printing head consists of comparatively short arms and the means for controling the movement during the down stroke of the head includes a substantially long guiding link the upper end of which is rotatably supported inthe frame of the machineso as to swing in a circular arc about the axis of rotation of the said link.

3. A safety appliance as claimed in claim 1 wherein the meansfor controlling the movement of the body includes a substantially long guiding link operatively'connected at the lower end to the means for hanging'the body and having its upper end pivotally connected to the frame of the machine above and a short distance in front of the axis of the hanging means so that from the commencement of the downward movement of the printing head an'upward rocking move ment of the protective body is efi'ectedabout the pivot by which it is secured to the printing head.

1 wherein a block is carried bythe printing machine above and forwardly of the printing head and wherein the means for controlling the movement of the protective'body includes a link, the upper end of which is pivotally and adjustably connected inthe longitudinal direction to the block, a projecting nose extending from the upper connected end of the link, the opposite end of the link being releasably andoperatively connected to the means for hanging the body to the head, the nose being arranged so that after the release of the connection between the link and the hanging means the link can be rocked about its pivot out of its working position and displaced in the longitudinal direction of its upper pivoted end and fixed in an inoperative position with the nose upon the supporting block. 7

5. A safety appliance as claimed in claim 1, wherein a spring bolt is mounted on the printing head, theend of the bolt normally projecting slightly outwardly and wherein the means for angularly suspending the-body includes pivoted arms, one of said arms being provided with an aperture for receiving the spring bolt at the time the device is moved to inoperative position.

6. A safety appliance as claimed in claim 1, wherein the meansfor hanging the body to the head includes pivoted arms and the means for guiding the body includes a link the lower end of which is pivoted to the arms, a block carried with the machine and pro vided with two holes located side by side for receiving the upper pivot of the link, one of the holes being used when employing broad printing pads and the other holes being used when employing narrow printing pads, substantially as and for the purposes set forth.-

7. A safety appliance as claimed in claim 1 wherein the protective body consists of a piece of resilient material having the bot tom surface of relatively breadth of the direction of swing and so curved that when the printin body rocks out of the path of the printing head the rear 4:. A safety appliance as claimed in claim;

considerable a JOSEPH KRELL.