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Application Gemco's Rotary Limit Switches are primarily used for machine tools, handling devices, and rotary operators where motion is expressed in shaft rotation. The primary purpose of the switch is to control the intermediate or end limits of a linear or rotary motion. The switch is often used as a safety device to protect against accidental damage to equipment. Description Quality parts make each Rotary Limit Switch highly dependable. • The 1/2" input shaft (includes Woodruff Key) drives a bronze gear which rotates the cam block. The cam block houses independently adjustable cams that actuate the precision type snap action switches. • Each switch can be provided with one to four single pole, double throw switches or a maximum of two double pole, double throw switches for versatility of control circuits. • No minimum speed is specified because snap action contacts are used. Maximum rated speed of the worm shaft is 1000 RPM and can be rotated clockwise or counterclockwise. • Gemco's Rotary Limit Switch offers the broadest range of standard gear selections of any switch available. Standard ratios range from 5:1 through 5333.3:1. • Max. Operating Temperature 180°F Enclosures NEMA Type 1 and 12 (General Purpose) enclosures are molded from FIBRALLOY® a special fiber glass material that is resistant to acids, alcohols, hydro carbons and heat. A tight fitting synthetic gasket prevents the entrance of oil and coolants. External mounting holes enable switch mounting without internal interference. (See Figures 1 and 2.) NEMA Type 4 (Watertight) enclosures are made of cast aluminum; cast iron or cast bronze enclosures can be provided upon request. NEMA Type 7 & 9 (Hazardous Location) enclosures are designed to meet the requirements of the National Electrical Code for Class 1, Group D, and Class 2. Groups E, F & G. The enclosures are made of cast aluminum; cast iron or bronze enclosures can be provided upon request. (See Figure 3.) |
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| Rotary Limit Switches | ||
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The GEMCO Rotary Limit Switch
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The GEMCO Rotary Limit Switch.
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The GEMCO Rotary Limit Switch.
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Mounting The switch may be mounted in any convenient position. An "L" shaped mounting bracket which permits innumerable mounting positions for all enclosures, can be supplied upon request. |
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Adjustment
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When the cam rotates, the switches "E" and "F" are actuated and the contacts change from the normally closed to open position and normally open to the closed position.
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 motor operated valves packaging machinery tapping heads elevating mechanisms
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pipe threading machinesindex tablestransformer tap changersconveyors
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Max Speed -- 1000 RPM worm gear type |
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spur gear type Operating Features  |
| Rotary Limit Switches | |
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spur gear type |
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GEMCO'S Spur Gear Type Rotary Limit Switch is used in applications requiring ratios below 3:1 and 1:3
for controlling the end and/or intermediate limits of reciprocating or rotary motion. This device extends the present line of Gemco Rotary Limit Switches by
providing ultra-sensitive control for small increments of motion. Many beneficial features include: • Control of motor-operated valves, dampers and hopper gates used in pipe lines, ventilating equip ment and material handling systems. • Improved environmental conditions for longer switch life. • Smaller space requirements. • Material and labor savings of reduced drilling, tapping, piping, and wiring. • Economies afforded when Gemco units are ap plied for many short travel end limit uses instead of conventional lever operated limit switches ac tuated by cams or dogs. • Unique mounting which permit these switches to be installed in convenient mounting positions. Mounting holes are provided for either direct or sprocket drive applications in three different positions. Description The basic switch units are actuated by independently adjustable cams which are driven by the input shaft. All cams are mounted on a common block, which is directly coupled or geared to the drive shaft. • Ratios Standard geared ratios between the input shaft and cam block are 1:1, 1/2:1, 1/3:1, 2:1, and 3:1. The 1:1 ratio may be supplied with a potenti-ometer gear coupled to the input shaft with ratios of 1:1, 1:2 and 1:3. |
• Long Life Switches Each enclosure can accommodate from two to four S.P.D.T. switches. All switches are provided with silver to silver contacts for reliability along with screw type terminals, 
Figure 5 Sketch showing: • independent adjustable cams A-D • switches E-F • Allen screws B-C for cam adjustment Mounting Unique mounting features permit these switches to be installed in any of three different positions. Mount-ing holes are provided for either direct or sprocket drive applications. Adjustment • Top cam ‘A' actuates switch ‘F'; bottom cam ‘D' actuates switch ‘E'. • Adjustment of cam ‘A' is independent of cam ‘D'. • To adjust cam ‘A', loosen cam locking screw ‘C' and rotate cam ‘A' until trip point of switch ‘F' is reached. • To adjust cam ‘D', loosen cam locking screw ‘B' and rotate cam ‘D' until trip point of switch ‘E' is reached. When the cams rotate, the switches are actuated and the contacts change from the normally closed to open position. (See Figure 5.) |
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Rotary Limit Switches
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| spur gear type | |
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Enclosures NEMA Type 1 and 12 (General Purpose) enclosures consist of a die cast housing and FIBRALLOY® cover. All mounting holes are external to the wiring cavity eliminating interference with internal wiring when the switch is mounted. Captive screws fasten the cover to the die cast housing and eliminate problems of misplaced screws. (See Figure 6.) NEMA 4 and 7 enclosures are constructed of aluminum to prevent corrosion. The NEMA 7 (Hazardous Location) enclosure is available for use in Class 1, Group D, areas as outlined in the National Electrical Code. Cast iron enclosures can also be provided on special request. All units are provided with an attractive red wrinkle finish. (See Figure 7.) Potentiometer An optional salient feature of mounting a 2 watt potentiometer within the enclosure, and gear coupled to the input shaft, is offered. This feature permits the potentiometer to be used as a remote position indicator or as a constant output auxiliary control device for open or closed loop feedback systems. (See Figure 8.) • Step-up geared ratios between the input shaft and the potentiometer are available to provide a choice of sensitivity and resolution to meet most applications. |
• The special type potentiometer allows continuous rotation of the drive and a zero or reference point to be adjusted
without removing any gears or components.
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SG Type.... | |
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....Rotary Application Assures accurate movement and placement of parts in all types of handling and positioning fixtures. NOTE - Replaces two limit switches and electrical piping. |
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Rotary Limit Switches spur gear type ROTARY LIMIT SWITCH |
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| Enclosure Type |
Input Shaft Rev. |
Cam Block Rev. |
Two Circuit S. P. D. T. Symbol A |
Two Circuit D. P. D. T. Symbol B |
Three Circuit S. P. D. T. Symbol C |
Four Circuit S.P. D. T. Symbol C |
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Catalog Number |
Catalog Number |
Catalog Number |
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| NEMA 1 & 12 | 1 1/2 1/3 2 3 |
1 1 1 1 1 |
2000-800 2000-801 2000-802 2000-803 2000-804 |
2000-805 2000-806 2000-807 2000-808 2000-809 |
2000-810 2000-811 2000-812 2000-813 2000-814 |
2000-815 2000-816 2000-817 2000-818 2000-819 |
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| NEMA 4 (1) |
1 1/2 1/3 2 3 |
1 1 1 1 1 |
2000-832 2000-833 2000-834 2000-835 2000-836 |
2000-837 2000-838 2000-839 2000-840 2000-841 |
2000-842 2000-843 2000-844 2000-845 2000-846 |
2000-847 2000-848 2000-849 2000-850 2000-851 |
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| NEMA 7 (1) |
1 1/2 1/3 2 3 |
1 1 1 1 1 |
2000-864 2000-865 2000-866 2000-867 2000-868 |
2000-869 2000-870 2000-871 2000-872 2000-873 |
2000-874 2000-875 2000-876 2000-877 2000-878 |
2000-879 2000-880 2000-881 2000-882 2000-883 |
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ROTARY LIMIT SWITCH WITH POTENTIOMETER | |||||||||||||||
| Enclosure Type |
Input Shaft Rev. |
Cam Block Rev. |
Pot. Rev. |
Two Circuit S.P.D.T. Symbol A |
Two Circuit D.P.D.T. Symbol B |
Three Circuit S.P.D.T. Symbol C |
Four Circuit S.P.D.T. Symbol C |
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Catalog Number |
Catalog Number |
Catalog Number |
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| NEMA 1 & 12 | 1 1 1 |
1 1 1 |
1 2 3 |
2000-820 2000-821 2000-822 |
2000-823 2000-824 2000-825 |
2000-826 2000-827 2000-828 |
2000-829 2000-830 2000-831 |
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| NEMA 4 | 1 1 1 |
1 1 1 |
1 2 3 |
2000-852 2000-853 2000-854 |
2000-855 2000-856 2000-857 |
2000-858 2000-859 2000-860 |
2000-861 2000-862 2000-863 |
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| NEMA 7 | 1 1 1 |
1 1 1 |
1 2 3 |
2000-884 2000-885 2000-886 |
2000-887 2000-888 2000-889 |
2000-890 2000-891 2000-892 |
2000-893 2000-894 2000-895 |
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(1) Contact Factory for Cast Iron or Bronze Enclosure. | |||||||||||||||
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Ordering When ordering desired switch, specify:
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Potentiometer Potentiometers can be provided with resistance of 1, 2, 5, 10, 20, 50, 100, 200, 500, 1000, 2000, 5000, 10,000, or 20,000 ohms. All potentiometers are rated at 2 watts. (Linear taper). Gear Ratio Selection In selecting a gear ratio, maximum accuracy and ease of adjustment are more easily obtained if rota tion of input shaft between limits is equal to, or less than, maximum settings between limits. For exam ple, if .8 revolutions of the input shaft is required to open and close a valve, a gear ratio of 1:1 input to cam should be selected. | |||||||||||||||||||||||||||||||||||||||||||
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TABLE 2 - basic switch data
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Special Cams*
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Heavy-Duty Dimensions
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Heavy-Duty Dimensions
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General Purpose Rotary Limit Switches | |
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Featuring:
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"L" SHAPE BRACKET
 Includes half inch hub extension.
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("L" shape mounting bracket, when purchased separately, is shown in some of the possible mounting positions by broken lines.) |
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NOTE: The maximum period for which the switch contacts are opened or closed during one revolution (360°) of the cam block assembly is 25° or 335°. Multiply the Rotary Limit Switch gear ratio times 25° or 335° to obtain the input shaft rotation which will yield 25° or 335° of cam block rotation. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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APPLICATION: The Type K Rotary Limit Switch is used in applications requiring ratios from 5:1 to 1080:1 for controlling the end and/or intermediate limits of a reciprocating or rotary motion. Two circuit and four circuit assemblies are available from stock. The NEMA 4 & 5 enclosure provides a clean environ-mental condition for the industrial duty snap action switches. Where motion can be expressed in shaft rotation either through a roller chain, gear train or direct coupling, the Type K Rotary Limit Switch makes it possible to open or close up to four independent circuits at the desired angular positions. |
DESCRIPTION: Precision rugged duty snap action switches, combined with a wide selection of gear ratios provides reliable electrical signals as a function of the shaft rotation. No minimum speed is specified due to the snap action contacts of the switch. The cam settings and the switch wiring can be easily accomplished through the full size cover. With the two circuit assembly, either a left hand or right hand shaft extension can be supplied. This pro-vides the added versatility when packaging this assembly in hard-to-get-at locations. | ||
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TYPICAL APPLICATIONS ARE:
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Industrial Duty Switches With Isolated Contacts  |
 DESCRIPTION This rotary limit switch is designed to control the limits of travel of rotating reversing equipment. The limit switch input shaft is connected to a worm gear. Adjustable self lubricating nylon roller cams are concentrically mounted to the worm gear. These adjustable cams actuate the precision limit switches by utilizing a lever assembly. INSTALLATION This limit switch may be mounted in any convenient position. when installed this limit switch will provide long life with a minimum amount of service maintenance. The following recommendations will prove helpful.
This limit switch was lubricated at the factory and should not require lubrication for the life of the switch. ADJUSTMENT Refer to figure 1. The electrical switch units “G” and “H” are shown with the contact positions assumed when the cams are not actuating the switch units. When the cam rotates and actuates the switch, the “B” (closed) contact opens and the “A” (open) contact closes. Each precision switch has (1) one independent adjustable cam. |
RENEWAL PARTS When ordering Renewal Parts give this form No. PF-047, Item No., Description, Part No., Quantity, and the Complete Unit Number stamped on the label. Reference FIG. #1 and FIG. #2 above.
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