US1824389A - Pressure regulating means - Google Patents

Description

p 1931- w. c. BROEKHUYSEN 1,824,389

PRESSURE REGULATING MEANS Filed July 14,-1927 z m w Patented Se a22,

UNITED: STATES PATENT OFFICE MACHINE & FOUNDRY.

a conromrron or NEW mnsmr PRESSURE BEGULATIN MEANS Application fled .7ru1 '14, 1927. Serial No. 205,825.

This invention relates to an improvement in pressure regulating means; and its mam object is the production of a device for applying a given predetermined pressure to an object, the device being automatically ren= dered inactive when the predetermined pressure is reached. Another object is the production of such a device especially adapted for use in connection with a photograph c printing machine in which the print ng is done by means of an electric arc, and the negative and press plate are *held under pressure during the exposure. With these and other objects not specifically mentioned in view, the invention consists in certain constructions and combinations which will 7 be hereinafter fully described and then specifically set forth in the claims. hereunto appended. I

go In the accompanying drawings, in WhlCh like characters of reference indicate the same or like parts, Fi 1 is an elevation,

partly in section, of a evice constructed in accordance with the invention and supported 85 by the pressure arm. of a photographic prlnting machine; Fig. 2ois a plan view, I artly in section, of the structure shown in ig. 1; Fig; 3 is an enlarged plan view of the motor reversing switch seen at the top .of

.30 Fig. 1; and Fig. 4 is a diagram of the of the device.

is-provided motor driven means for apply ing pressure, and controlling means automatically governingthe actionof 'said'applying means in accordance with predeter mined pressure; and when the device is to be used in connection with a hotographic rinting machine, both of sai -means may be supported by the pressure arm of said machine, and thearc light of sililild machine contro 'ngmeans.

' may be governed by sai In the best constructions contemplated, the appl ing means includes a movable J ressure member and a fingercarried .there y, and the controlling means includes a motor reversing switch actuated b said 'fingeg; the controlling means further includes a weight- 50 ed lever and a coasting rock lever keeping electrical connections showing the operation In carrying the invention into effect, therethe applying means iii action only until the predetermined pressure is reached. The above mentioned means andpartsma be considerably varied in construction within the scope of the claims, for the s ecific struc-,- ture selected to illustrate the invention is but one of numerous possible concrete embodiments of the same. The invention there-- fore is not to be restricted to the precise details of the structure shown and described.

Referring to the drawings, 5 indicates the swinging pressure arm of the well known Ogden photographic printing machine, and in the outer end of this arm is mounted a pressure plunger 6 by means of which a sensitized press plate and a negative are pressed together upon the glass plate 7 before exposing the same tojthe action of the arm lamp 8 placed below it.

. Supported by --the arm 5 is an electricmotor 9, which, preferably, is a single-phase motor having a separate starting coil with a centrifugal cutout. A splined coupling 10 connects 'the shaft of the motor 9 with the driven shaft 11, so that the shaft 11 may be moved axially while being revolved by the motor 9. On the shaft 11, to move with it is mounted a worm 12 which, in the central long'tudinal position of the shaft 11, meshes wit a worm wheel 13 on a illlaft 14,. the lat-. ter'carry' a inion 15 mes 'n with a ur gear 16.dii a saft 17. The sha ft 17 ca i'ies a pinion 18 engaging a rack 19, formed in the plunger 6 before referred to. The shafts 11, 14 and 17 are supported by a gear housin 20 on the arm 5.

p'on the floating shaft 11 is mounted a box 21 containing a thrust bearing 22 to take up the end thrust of the shaft 11 and which has trunnions 23 engaging forked levers 24 mounted on the fulcrum 25 of a T-lever 26, which on its two ends, carries rollers 27. The'shaft 25 is supported by a bracket 28 fastened to the arm 5, and the bracket 28 carries a fulcrum 29 for a weighted lever'30 which is so mounted that when in 'its horizontalv 'tion it en both rollers 27 of the -lever 26 wh1ch is then I in its neutral position. I

- Mounted on the long end of the'lever is a slide 31 carrying an adjustable weight 32, by means of which the pressure to be applied may be regulated. The-short end of the lever carries a movable counterweight 33 which serves for finer adjustment of the effect of the weight 32.

At the heavily weighted end of the lever 30 is fastened a contact-maker 34 which engages a control switch 35 attached to the pressure arm 5. The switch 35 has four contact springs 36, 37, 38 and 39 insulated from one another and so arranged that upward movement of the contact-maker 34 first, closes the contact of the springs 38 and 39, and then opens the contact of the springs 36 and 37, and the downward movement of the contact-maker 34 first closes the contact 36-37 and then opens the contact 38-39.

Upon the top of the pressure plunger 6 is mounted a finger 40 which engages a forked lever 41 of the motor reversing switch 42 mounted upon the gear housing 20. A plan view of the switch 42 is shown in Fig. 3. The lever 41 is connected with a cross bar 43 by a rod 44, which is pivoted thereto and slidable in theinner end of the lever 41. To the cross bar 43 are secured the ends of two flat contact springs 45, their stationary ends being attached to the upright sides of a U-shaped insulating block 46 and being provided with terminals 47. A coil spring 48 inserted between the pivots of the rod 44 is placed under compression by either movement of the lever 41 and swings the ends of the springs into contact with the upper pair of terminals 49 when the rod moving end of the lever 41 is down, and into contact with the lower pair of terminals 50 when the 'lever 41 is up, the terminals 49 and 50 being attached to the insulating upright 51 of the switch.

In the diagram (Fig. 4) of the electrical connections, 52 indicates the two lead-in wires of the single-phase supply circuit, the wires being marked with the positive and negative signs for identification in following up the circuits. 53 indicates the pro-' tecting fuses, 35 the pressure control switch, and 42 the motor reversing switch. 54 and 55 are push buttons, 56 is the electro-magnetic motor operating switch controlled by the coil 57, and 58 is the electromagnetic arc circuit switch, controlled by the coil 59. 6061 is a double relay controlled by the coils 62 and 63. 64 is the timer for the arc-circuit, controlled by the coil 65. 66 is the main-winding of the motor 9, 67 its starting-winding, and 68 the centrifugal cutout of the motor which disconnects the starting-winding by automatically opening a contact when the motor is running.

I The operation of the device is as follows: When the machine is not operating, the pres sure plunger 6 is up, the finger 40 through the lever 41 having set the reversing switch motor 9 by energizing its main-winding 66,

its starting-winding 67 being in circuit through the switch 42. The subsequent turning ofthe worm 12 by the motor 9 causes an outward movement of the driven shaft 11, thereby bringing, through the trunnions 23 and arms 24, the lever 26 into its neutral position and permitting the weighted end of the lever 30 to descend, closing the contact 36 and opening the contact 39. The current now passing to the coil 57 through the contact 36-37, the push button 54 can be released without thereby stopping the motor 9, which will keep on running and driving the gears 12, 13, 15, 16, 18 and 19, until'the plunger 6 has reached its operating position under full pressure, whenthe resistance of the load just balances the'turning moment of the weight 32. On its way down, the finger 40 attached to the plunger 6 engages the lever 41 the switch 42, thereby reversing the same, so that the motor after having stopped will then start in the opposite direction. The motorwill not reverse while running because then the starting coil 67 is disconnected by the action of the centrifugal cutout 68. As the plunger 6 attains its full working pressurepthe gears 19. 18, 16, 15 and 13 are locked by the stoppage of the plunger. Therefore, the worm 12 and shaft 11 travel forward, turning the T-lever 26 and raising the weight end of the lever 30. This movement of the lever 30 opens the contact 36, thereby stopping the motor 9, but first closes the contact 39 allowing current to flow through the coil 59 by way of the contact 49 of the switch 42, thereby closing the electromagnetic switch 58 and starting the arc 8,-and also putting the timer coil 65 into circuit. At the end of the time operating period, the timer contact 64 closes, thereby energizing the coil 62 of the relay and closing the contact 60 of the same, so that now current can flow through the. coil 57 from the switch 58, thereby closingthe switch 56 and again starting the motor 9. The latter, since the switch 42 has been reversed by the down coming of the plunger 6, this time runs in the opposite direction, thereby moving back. the shaft 11. This backward movement of the shaft 11' turns the lever 26 into neutral position, allowing the weighted end of the lever 30 to descend,

thereby closing the contact 36 and opening 1351 the contact 39. The breaking of the contact 39 interrupts the current in the coil 59 and opens the switch 58, thereby stopping the are 8; the closing of the contact 36 sends current through the coil 57 on opening of the switch 58 and keeps the motor 9 running, so that now it will raise the plunger 6. When the latter has arrived at its uppermost position, the finger 40 actuates the lever i1, thereby reversing the switch 42 and the shaft 11, upon stoppage of the plunger 6 by the stop screw-69, moves backward turning the T-lever 26 and raising the weighted end of the lever 30, thus bringing all switches and contacts .back into their original positions at the starting of the operation.

The coil 59 of the electromagnetic switch 58 is connected to that side of the reversing switch 42 which is in circuit when the motor 9 is raising the plunger 6, so that the switch 58 will always be open when the switch 42 is set for downward operation of the plunger, and the arc circuit cannot be closed until the switch 42 has been reversed on the downward travel of the plunger.

The coil 63, which is in series with the are 8, closes the contact 61 in case of overload in the arc circuit, thereby opening the switch 58 and stopping the arc.

The push button 55, which is normally closed and'opens when depressed, serves as a cutout if the operator wishes to stop the motor during the operation of the device.

The thread angle of the worm 12 is small enough to make the worm self-locking in the worm wheel; otherwise the pressure on the plunger would be released when the driving force is shut off by stoppage of the motor. The direction of the worm thread,

right or left handed, is preferably so chosen that the worm when advancing the plunger into load position, travels in the direction of the weight 32 toward the fulcrum 29 of the lever 30, because in this case the end thrust on the shaft 11, due to the pressure exerted by the plunger, is communicated to the lever 30 thi'ough the end of the lever 26 nearest the fulcrum 20 of the lever 30, so that a much smaller weight 32 is sufficient for a given pressure than would be required if the thrust were to act on the longer leverage due to the farther end of the lever 26.

What is claimed is:

1. The combination with motor driven means for applying pressure, of pressure actuated motor reversing means automatically governing the action of said applying means.

2. The combination with motor driven means for applying pressure, of pressure actuated motor reversing means automatically governing the action of said applying means, said applying means including a movable pressure member and a finger carried thereby, and said controlling means including a motor reversing switch actuated by said finger.

3. The combination with motor driven means for applying pressure, of pressure actuated motor reversing means automatically governing the action of said applying means, said controlling means including a weighted lever and a coacting rock lever keeping the applying means in action only until the predetermined pressure is reached.

4. The combination with motor driven means for applying pressure, of pressure actuated motor reversing means automatically governing the action of said applying means, said applying means including. a worm wheel and anactuating worm, and said controlling means including means for holding said worm wheel and said worm in mesh only until the load on the worm wheel reaches a predetermined limit.

5. The combination with a motor having a driving shaft, of a driven shaft, a splined coupling connecting said shafts, a worm carried by the driven shaft, a worm wheel normally driven by said worm, and means for holding said worm wheel and said worm in mesh only until the load on the worm wheel reaches a predetermined limit.

6. The combination with a motor, of a worm driven by said motor, a worm wheel normally driven by said worm, and a weighted lever and coacting rock lever holding said worm wheel and said worm in mesh only until the load on the worm wheel reaches a predetermined limit.

7. The combination with a motor having a driving shaft, of a driven shaft, a splined coupling connecting said shafts, a worm carried by the driven shaft, a worm wheel normally driven by said worm, and a weighted lever and coacting rock lever holding said worm in mesh only until the load on the worm wheel reaches a predetermined. limit.

8. The combination with motor driven means for applying pressure, of pressure actuated motor reversing means automatically governing the action of said applying means, said pressure actuated means being operative to maintain a predetermined pressure for a definite period of time only.

9. The combination with motor driven means for applying pressure, of pressure actuated means automatically governing the action of said applying means to maintain a predetermined presusre for a definite period of time only. i

10. The combination with motor driven means for applying pressure, of pressure actuated means automatically governing the action of said applying means to maintain a predetermined pressure for a definite period of time only, said pressure actuated means including motor controlling mechanism.

11. The combination with motor driven means for applying pressure, of pressure actuated means automatically governing the action of said applying means to maintain a predetermined pressure for a definite period of time only, said pressure actuated means including motor reversing mechanism operative at'the end of said period.

12. The combination with motor driven means for applying pressure, of pressure actuated means automatically governing the action of said applying means to maintain a predetermined pressure for a definite period of time only, the'motor driven means including a drive train and the pressure actuated means including mechanism incapacitating the drive train.

13. The combination with motor driven means. for applying pressure, of pressure actuated means automatically governing the action of said applying means to maintain a predetermined pressure for a definite period of time only, the pressure actuated means including means for reversing the action ofthe applying means after said period.

14. The combination with means for applying pressure, of an electric motor for driving said means, and pressure actuated means automatically governing the action of said applying means to maintain a predetermined pressure for a definite period of time only, said pressure actuated means including a reversing switch for the motor.

15. The combination with means for applying pressure, of a motor, a drive train response to a predetermined load, and means actuated, by the movement of said element controlling the motor, said mechanism permitting movement out of driving engagemen; of the element.

17. The combination with pressure applying means, of a motor for operating said applying means, and pressure actuated motor controlling means to automatically stop themotor and after a predetermined period start the same in reverse direction.

plying pressure, of motor actuated drive means operating said applying means, mechanism incapacitating said drive means in response to a predetermined load and motor controlllng means operated by said mech anism.

the other. 18. The combination with means for aptuated motor reversin means automatically governing the action 0 said applying means, and the pressure arm of printing machine supporting both of said means with said applying means in position to exert pressure on photographic printing elements in said machine.

20. In a photographic printing machine,

a photographic the combination with motor driven means plunger of a photographic printing machine positioned to exert pressure on photographic printing elements in said machine, and reduction gearing connecting said plunger and the motor of said applying means.

22. The combination with motor driven means for applying pressure, of pressure ac- 'tuated motor reversing means automatically governing the action of said applying means, said applying means including the pressure plunger of a'photographic printing machine in position to exert pressure on'photographic printing elements in said machine, anda floating worm drive connecting said plunger and the motor of said applying means and governed by said controlling means.

23. In a photographic printing machine, the combination with motor driven means for applying pressure to photographic printing elements in said machine, of pressure actuated means automatically governing the action of said applying means, and an are light for said machine, said governing means including common means for starting the arc and stopping the motor.

24. In a photographic printing machine,

the combination with motor driven means for applying pressure to photographic printmg elements in said machine, of pressure actuated means automatically governing the action of said applying means, an are light for said machine, said governing means in cluding a motor controlling switch, an arcconirolling switch, and common means to simultaneously open one switch and close In testimony whereof, I have signed my name to this specification.

WILLIAM C. BROEKHUYSEN.

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