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The company was originally founded in by Franz Hermle as a manufacturing facility for clock components and movements. During the occupation of Germany following World War II most of the original production equipment was dismantled and removed from the Hermle Factory.
Since that time Hermle has become a leading contender on a global scale in the clockmaking industry. In 1 Hermle saw a need to open a plant in the United States of America.
Amherst, Virginia was selected as the home for this modern manufacturing facility. This new plant has become one of the most efficient clockmaking plants in the industry. The plant in Amherst uses the name Hermle Black Forest Clocks to distinguish itself from the parent company. Hermle clock movements have been designed with the clockmaker who will service them in mind.
In all probability they are among the easiest movements in the world to service. Once the basic principles of operation set forth in this manual are understood, this knowledge can easily be transferred from one movement to another. The ready availability of parts and replacement movements offers a wide range of options to clockmakers servicing Hermle products and to the customers they serve.
Some of the factors that cause Hermle movements to lend themselves to being easily serviced, replaced, repaired or restored lie in the very rational way that every movement has been de signed: 1. All Hermle movements operate on the same principles. Different models with variations in escapements, striking, chiming mechanisms and spec ial features are all placed on basic movements that can be counted on to operate in the same manner as other Hermle movements do.
A rational system has been used to categorize Hermle movements into groups, Once the principles of operation have been mastered for one movement, the variations can be identified and dealt with quite easily. These groupings make it easy to order parts and replacement movements when they are required. Hermle repair parts and replacement movements are readily available through supply houses supporting the clockmaking trade. These are identified in spare parts lists pub lished by the factory.
The use of these lists in conjunction with this service manual makes it extremely easy to procure the material necessary to provide top quality service to the customer. In other instances he may be asked to locate the cause of a minor malfunction and correct it. The latter can occur both on new clocks that have just been put into operation as well as those that have been working for several years.
Except as a matter of convenience, it is rarely necessary to remove a clock and take it to the shop to perform routine service functions.
Repair Repair is generally accepted as meaning that the movement has a worn or broken component that requires attention before the clock can be expected to render reliable service. This may involve extensive disassembly of the movement to gain access to the part needing attention.
In other instances repairs can be performed on components outside the plates in an expedient manner. Essentially then, a repair is accomplished to solve one or more specific problems, may or may not involve a considerable amount of time, and may or may not require the complete disassembly of the movement.
If the movement does require disassembly, a proper cleaning should be considered as it will improve the reliability of the movement and is in the best interests of both the customer and the clockmaker. Restoration Some customers may prefer to keep the original movement intact for sentimental reasons even after the time involved and the labor costs have been explained to them. Restoration is normally meant to include complete disassembly of the movement and giving detailed attention to all of the component parts that are likely to have been affected by wear, oxidation or other factors that would affect its reliability.
Specifically then, a properly restored Hermle movement should have the appearance and reliability of a new one. As every component must be removed and disas sembled completely, a proper cleaning must always be a part of the restoration process.
Replacing a movement in a modern clock with one of the same specifications is an entirely acceptable procedure and should not be confused with the undesirable act of destroying an antique clock by substituting an improper movement.
One advantage to replacing the move ment is that the cost of labor and the cost of the movement can be computed quickly and accu rately in most cases. The movement will usu ally have to be removed from the case to perform the services outlined in this section.
Timekeeping Problems When a relatively new clock refuses to run: Check the clock to identify any obstructions such as the pendulum contacting the case. Check for indirect causes of friction such as the pendulum leader binding in the crutch.
Check for friction caused by gummy oil or drying of the lubricants in the time train, especially in the escapement area. If the movement is found to be dry of lubrication remove the gummy oil residues with a sharpened piece of pegwood so the train is free.
Lubricate the movement using the procedures outlined in the lubrication section. Check the stability of the clock. Floor clocks are likely to stop if they are sitting on a soft carpet. To cure this problem a stable platform can be constructed under the clock or it can be secured to the wall. Check the beat and insure the automatic beat adjusting mechanism is in good operating order.
Check for wear which might warrant the repair, restoration or replacement of the movement. Servicing Chiming and Striking Failures As in the time train, friction or obstructions are the major causes of chiming and striking failures.
Check for obvious obstructions to the hammers to include the position of the shutoff device. Check to insure cables and chains are not binding or caught. Check the lubricant in the chiming or striking trains.
If it has dried out, remove the residues with a sharpened piece of pegwood and lubricate in accordance with the guidelines in the lubrication section. If the movement is capable of chiming, but fails to strike, check for excessive friction in the striking train or in the linkage to the striking hammers. Section 2 Repair of Hermie Movements A movement requiring repair usually has excessive wear, may have a component that requires replacement; or might have a condition that must be corrected before the clock can be expected to operate reliably.
Repairs to the time train Damage to the self adjusting beat setting mechanism is best accomplished by replacing the complete assembly. As in servicing, the greatest cause of repair problems will center around the pivot holes and the sliding surfaces. If the movement has to be completely disassembled it is advisable to service the center shaft assembly.
Slip the clip off and clean the old residues away. If the disassembled clock is to be cleaned, leave this assembly apart until all of the components have been dried, lubricated and are ready for reassembly.
Check chains and cables to insure they are capable of operating correctly. If a chain has been overstressed and the links have opened these must be closed and brought back to their normal shape. Consider replacing the complete chain or cable if it has been damaged. Damage to the escapement signals that it is best to remove the unit and replace the dam aged parts in an environment where a suitable test run can be conducted and the required adjustments can be accomplished.
Chime and Strike Repairs In a dusty environment it is possible for the star wheel to cut into the lifting tab that activates the chime hammer. Replacing this assembly is the most expedient means of solving this problem. Minor repairs can be accomplished by smoothing the face of the tab with a file to insure the star wheel teeth cannot get caught in the groove. Damaged lifting surfaces on the chime drum are best dealt with by replacing the complete assembly, as are damaged hammers and levers.
Every component that is not riveted or permanently joined should be removed during the resto ration process. This allows the cleaning solutions to reach every surface of each component part. Once every part of the movement has been cleaned, a meticulous inspection must be made of each component. Look for signs of wear and fractures that might cause problems in the future.
Reject any part that does not appear capable of providing reliable service and replace it with a new one. Return worn pivots to a round and smooth condition. If it appears that nickel plating has broken away from the pivots on older movements, it is best to replace the wheel assembly. Bush each pivot hole that has any possibility of harboring nickel residues.
Inspect each pivot hole for wear. If metal has worn away from the plate or the pivot shows signs of wear, it is best to bush the hole. Detailed instructions on how to accomplish this operation are contained in Chapter VII. Smooth all wear tracks out of each sliding surface. If grooves have been cut in lifting surfaces it is best to replace the component or restore the metal that has been worn away in a repectable manner.
The movement should then be reassembled, lubricated in accordance with the instructions in Chapter IV, and test run for a reasonable amount of time.
At the end of the restoration process the movement should have a respectable cosmetic appearance and should be capable of per forming all of its functions in a reliable manner. Section 4 Replacing Ilermie Movements The repair technician can recommend the option of replacing a Hermle movement with full con fidence. Hermle can supply an exact replacement or an improved model with the same or better capabilities than the original in almost every instance.
There are several advantages to replacing a worn or damaged movement. When mechanical movements operate over a number of years it is unusual for wear to concen trate itself in only one or two locations. There are always the obvious wear points such as pivot holes in locations receiving a great deal of stress or shock.
There are tracks that form in sliding surfaces and in the pallets. The cumulative combination of this wear is often difficult to deal with economically. This is especially true when a movement must be disassembled several times to correct problems that are not immediately obvious and do not become apparent until after the clock fails to work reliably during a test run.
Many customers and competent technicians share a reluctance to replace a clock movement. This reluctance may stem from a well founded belief that this practice is wrong and should not be engaged in.
Without a doubt, it is not a good practice to change movements in antique clocks or in special timepieces that will lose their value if they are altered. However, changing the move ment in a modern production line clock does not have a negative effect on its value.
Conversely, if a clock of this nature has been put in good running order its value will probably be much higher. A hundred years from now this may not be the situation with the same clock. When the cost of a replacement movement and the amount of time it will take to install it is known, a very accurate estimate can be given to the customer.
Unless the customer is intent on keeping the clock in its original condition for sentimental reasons it is best to recommend the replacement of a worn modern movement rather than engaging in restoring it. It is usually in the best interest of both parties to do so. Once the basic functions of one or two movements have been mastered, the others can be understood quite readily. This section provides a very basic outline to assist the technician in his understanding of Hermle Mechanical movements and how they operate.
More specific information on timing and adjustments will be presented later in this manual.
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