Dynamic information storage or retrieval – Dynamic mechanism subsystem – Specific detail of storage medium support or motion production
Patent
1987-10-05
1989-01-24
Stephan, Steven L.
Dynamic information storage or retrieval
Dynamic mechanism subsystem
Specific detail of storage medium support or motion production
G11B 3302, G11B 1920, H02K 500
Patent
active
048005533
DESCRIPTION:
BRIEF SUMMARY
The invention concerns the device recited in the preamble to claim 1.
Motors are secured in devices in such a way that they can carry out their function at a constant quality.
Securing a motor directly to a chassis by means of flanges and screws and then inserting the drive mechanism (turntable or similar component) is known. Problems with balance, however, sometimes occur.
The object of the invention is to make it possible to insert a motor subject to conditions that are desirable from the aspects of tolerance and balance.
This object is attained in the device recited in the preamble to Claim 1 in accordance with the characteristics recited in the body of that claim. Further developments of the invention will be evident from the subsidiary claims.
One embodiment of the invention will now be described with reference to the drawing, wherein
FIGS. 1 and 2 represent the state of the art and
FIG. 3 illustrates one embodiment of the invention.
FIG. 1 illustrates a chassis 1 for accommodating a motor 2. The shaft 3 of motor 2 extends through chassis 1 from the bottom. Screws 4 secure an invisible flange on motor 2 to chassis 1. A turntable 5 that accommodates phonograph records is secured over shaft 3. There are accordingly problems with balance and tolerance. Although an acceptable tolerance can be established in the embodiment illustrated in FIG. 1, the turntable cannot be secured to the shaft until the motor has been inserted. The balance ratios are accordingly very detrimental, and can only be checked and if necessary corrected at high expense.
FIG. 2 illustrates a chassis 1 wherein motor 2 is assembled into a single unit along with turntable 5 by means of a flange 6 and screws 7, such that its balance can be checked before being inserted into chassis 1. This embodiment, however, has detrimental tolerance conditions because the tolerances of the screw-on flange and those of the screw-on motor-flange unit can become superimposed.
FIG. 3 illustrates a chassis 1 prepared to accommodate a motor 2 that has already been checked and provided with a turntable 5 and requiring no screws. Once turntable 5 has been secured to motor shaft 3 by pressure and/or cement, subassembly 2 & 5 can be checked and corrected for balance. Motor-and-turntable unit 2 & 5 is positioned for mounting on chassis 1 through a recess 8 in chassis 1 and a slot 9 in a centering structure 10. A retaining spring 11 is inserted into a groove 12 on what is called a centering shoulder 13 on the subassembly at that point.
A pin 14 that extends parallel to the driveshaft can be mounted on the motor housing or on the centering shoulder and extend into a matching bore 15 in chassis 1 to prevent relative rotation. A tongue 16 on retaining spring 11 engages a bearing 17 on chassis 1 and prevents the spring from moving on its own accord. Thus, only one retaining spring 11 is needed to secure motor 2 to sheet-metal chassis 1. Centering shoulder 13 must accordingly have a constriction all the way around where it engages groove 12. Motor 2 can in conjunction with the mounted turntable 5 be inserted through the matching recess 8 in chassis 1 and through narrow slot 9 into an adjacent centering bore 10 and lifted at that point. In this position retaining spring 11 is shifted into the constriction around centering shoulder 13 until tongue 16 snaps into chassis 1. A longitudinally curved, more or less rectangular retaining spring 11 with two prongs and a tongue 16 that bends down at a right angle has been proven practical for this embodiment.
The design in accordance with the invention has many advantages. It requires no screws. It can be assembled rapidly. The motor is precisely positioned. The turntable can be forced onto and/or cemented to the shaft before the motor is mounted. The retaining spring and chassis are stampings, which can be cost-effectively manufactured. Service is facilitated by the potential for replacing the components. Positioning tolerances are low, only 1/4 of those that can be attained with the embodiment illustrated in FIG. 2.
The version
REFERENCES:
patent: 2948539 (1960-08-01), Kenney
patent: 3330515 (1967-07-01), Janssen et al.
Research Disclosure #181, Havants, Motor Mount, 5/79.
Deutsche Thomson-Brandt GmbH
Fogiel Max
Stephan Steven L.
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