US1813780A

US1813780A - Timing device

Info

Publication number: US1813780A
Application number: US206013A
Authority: US
Inventors: Ralph V Tuttle
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-07-15
Filing date: 1927-07-15
Publication date: 1931-07-07
Anticipated expiration: 1948-07-07

Description

July 7, 1931- R. v. TUTTLE 1,813,780

TIMING DEVICE Fild July 15, 1927 2 Sheets-Sheet 1 N/lTNESSES INVENTOR m fiZPf/KTHTTLE Hwy/ 3m ATTORNEYS July 7, 193.1. R. v. TUTTLE I ,8

TIMING DEVI CE Filed July 15, 1927 gsheets-Sheet 2 7 zf ya WITNESSES INVENTQR v P/fZP/V 1 72/7724 ATTORNEYS Patented July 7, 1931 RALPH V. TUTTLE, F LEWISTON, IDAHO TIMING DEVICE Application filed July 15, 1927. Serial No. 206,013.

This invention relates to a timing device for printing photographs.

An object of the invention is the provision of a device which is adapted to be automatically operated by the usual platen and printing frame bringing an electric lamp into play and for timing the period for the exposure of .the photographs to the rays 1b lamp.

of the -.A further object of the invention is the eration of the platen of a printing device when said platen is moved to an operative position, the period of illumination being determined in advance of the actuation of .the platen.

This invention will be best understood from a consideration of the following detailed description, in view of the accompanying drawings forming a part of the specification; nevertheless it is to be understood that the invention is not confined to the disclosure, being susceptible of such changes and modifications which shall define no material departure from the salient features of the invention .as expressed in the appended claim.

Inthe drawings Figure 1Iis a plan view shown moreor less diagrammatically, of the timing device for exposing photographs tothe rays ofan electric lamp,

Figure 2 is a fragmentary section showmachine,

, ting the tripping means adapted to be actuated-by the movable platen of the printing Figure 3 showsdiagrammatically the elec tricscircuit associated with the device,

. 5 Figure 4 is a plan view partly in section of the-timer,

Figure 5 is-a longitudinal side view partly insection of the timer,

Figure 6 is an end view with the '50 partly broken away,

casing Figure 7 is a transverse vertical section taken along the line 77 of Fig. 5, and

Figure 8 is a fragmentary enlarged end view showing the sketch operating mechanism in closed position.

Referring more particularly to the drawings 10 designates the base member on which is mounted a housing 11 which is adapted to house a rotary timing cylinder 12. The cylinder 12 is rigid with a shaft 13 mounted in bearings in the

end walls

14 and 15 of the housing. The cylinder has secured to its outer surface, a copper strip 16 which is of irregular form and which will be presently described in connection with the switch mechanism.

The shaft 13 is driven from a motor 17 by means of a chain 18 and a sprocket 19 and shaft 13 and a pair of clutch members. The outer free end of the shaft which projects beyond the wall 14 is supported in a bearing 20 carried by the base member 10.

One element 21 of the clutch member is pinned at 22 to the shaft 13 and is in the shape of a disk. The inner face has prongs or lugs 23 projecting laterally therefrom and adapted to be received within pockets 24 of a similarly constructed disk 25 which is slidably mounted on the shaft 13 but is adapted to drive the shaft when said disk is rotated. The disk or clutch element 25 has an annular groove 26 which receives the arms of a yoke 27 so that when the arms 28 of said yoke are moved towards the disk 21 the lugs 23 will be received within the pockets 24L and the disk 25 will be in contact with the disk 21 whereby disk 21 will cause rotation of disk 25 and rotation of the shaft 13 and cylinder 12. The yoke 27 is pivoted at 29 in spaced brackets 30 secured to the base member 10. A ring 31 connects the yoke 27 with the upper end of a lever 32 pivoted on a shaft 33 which is mounted in bearings 34 carried by an end wall 14. The other end of the lever is connected to a Bowden wire 35 the sheath 36 which houses the wire is secured at one end to a bracket 37 mounted on the base member 10. The other end of the sheath, as shown at 38 (Fig. 2), is secured to a table 39 and the wire 35 passes through the table and is provided with a head adapted to be engaged by a movable platen 41 hinged at 42 to the table 39. A spring 43 has one end in engagement with the head 40 and the other end in engagement with the bottom of a pocket 44 formed in the table 39 so that when the platen 411 is depressed the head will be forced down wardly against the .tension of the spring 43, the spring being adapted to force the head back to its normal inoperative position as will be presently explained; A coil spring 46 embraces the shaft 13 and has one end in engagement with the wall 14, while the other end is in contact with a fiangeet'? of the clutch element 25, whereby said spring will tend to force the clutch element 25 into engagement with the clutch element 21.

. A lever 50 is rigid with the shaft 33 and is connected by means of a cable or wire 51 with a lever 52 rigid with a shaft 53. The shaft 53 ismounted in bearings in the

end walls

14 and 15 and adjacent the top of the casing 11. The shaft 53 carries rigidly secured thereto a cam 54 which extends approximately the entire length thereof so that it will be in position to act upon a switch box 55 for depressing the same and'forcing the roller 56 into engagement with the cylinder 12. A square shaft 60 is adapted to be received by a square opening in a plate or block 61 secured to one end of the base member 62 of the switchcasing 55.. A flexible arm 63 is rigidly secured to the base member 62 of the casing 55 and has a contact member 65 adapted to engage a contact 66'carri'ed by a flexible arm 67 to the top of the switch casing so that when the switch boxis moved downwardly for causing the roller 56 to move into contact with the raised strip 16, the flexible switch contact arm 63 is moved upwardly causing the contacts 65 and 66 to close the circuit connected therewith which is indicated by the wires 69 and 70.

As shown more clearlyin Fi' 3, the wire 69 is connected with the lamp 1, while the wire 70 is connected with a source of current 72 and the wire 73 connects the other terminal of the lamp with the remaining terminal of the source of current 7 2. A manually operated switch 7 4 must be closed before the automaticdevice is brought into action for closing the circuit to the lamp 71. The lamp 71 is carried by a bracket 75 and is normally positioned so that it will properly illuminate a negative when the platen 41 is actuated.

A spring has one end secured at 81 to the end wall 15 of the cylinder. The other end of the spring is secured to a shaft. 13 so that when the cylinder is revolved in one direction, as indicated by the arrow, the spring will be placed under tension so that when the cylinder is released the said spring will revolve thev cylinder in the opposite direction and return it to its normal inoperative position.

varying lengthsfoftravel of the roller56 on the strip 16, which provides for a variation in the closing of the circuit. Therefore, the time of the closing of the circuit will depend upon the width of the strip at the point over which the roller travels and the speed of the drum.

The spring 80 which has one end connected to the drum 12and the other end fixed to the casing 15, will rotate the drum 12 in an opposite direction after the drum has been revolved for increasing the tension on said spring by the motor 17. Therefore, the spring will return "the drum to its normal position wherebyit will be in positionfor again timing the printing of the photograph.

The spring 43 when compressed, will be under sufficient tension to raise the platten 41 and operate the lever 32 to move the clutch member 25 out of engagement with the member 21, and against the tension of the spring 46.

The operation of my device is as follows:

A sheet of sensitized paper is placed over the negative in the usual manner on the table 39 and the platen is moved downwardly onto the negative. As the platen. engages the head 40 saidhead is forced downwardly actuating the Bowden wire thereby rocking the lever 32 and causing the clutch member 25 to be moved into engagement with the clutch member 21 whereby the pairs of lu s 23 will be received within a pocket 24 loc ing 7 the clutch elements together. Since the shaft 13 is being rotated by the motor 17, the shaft 13 will likewise be revolved causing rotation of the cylinder 12. As the lever 32 is rocked, the shaft 33 is likewise rockedwhereby the cable is released so that the spring 90 will raise the free end of lever 52 and rock the shaft 43 so that the member 5 1 moved downwardly forcing the switch box 55 downwardly until the roller 56. engages the cylinder'l2i Since this cylinder is revolved the roller will ride over'the raised,

strip 16 forcing the flexible arm 63 upwardly whereby the circuit is closed through the contacts 65'and'66. At thistime thelamp 71 is illuminated and will remain illuminated as, longas the roller is riding over a portion of the raisedstrip 16. Before' the platen is operated, however, the switch box is moved along the shaft 60 until it is properly positioned for timing the lightingv of the lamp. It will be noted that the strip 16 is so placed on the cylinder 12 that any timing may be had for closing the circuit.

I claim In a timing device for printing photographs, a cylinder, means for rotating the cylinder, a contact strip of rogressively increasing width on the cylin er, a shaft rockably mounted adjacent the cylinder, a lever slidably mounted on the shaft but rockable with the shaft, a resilient arm secured to the lever and having a contact member at the free end adapted to engage the contact strip and the cylinder, a switch element on the lever, a second switch element on the resilient arm adapted to be moved into engagement with the switch element on the lever when. the contact member is in engagement with the contact strip, the second switch element being out of engagement with the first element when the contact member is in operative relation with the cylinder.

RALPH V. TUTTLE.