JPH074958B2 - Printing devices such as typewriters and printers - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention has a housing, in particular a mechanical frame integrated into the bottom trough of the housing, and a damping leg located below the bottom trough. The present invention relates to a printing device such as a typewriter and a printer.

[Prior art]

The construction method, in which the machine frame is formed integrally with the housing, stands out for its cost-effective feasibility. In such a known solution, a damping leg made of rubber or damping plastic is provided,
It is also known to reduce the transmission of vibrations from the typewriter housing to the underlayment, and thus typically to the typewriter table.

[Problems to be Solved by the Invention]

However, with the known constructions, the problem remains that vibrations are transmitted from the machine frame to the housing, in particular to the bottom trough, whereupon the housing forms a resonator, which resonator increases the vibration of the machine housing. Correspondingly, such configured machines are relatively loud.

Starting from this, the present invention creates a solution in which the generation of noise can be reduced by simple and cost-effective means, while taking advantage of the basic advantages of the integration of the machine frame and the housing. Is the basis of the task.

[Means for Solving the Problems]

In order to solve this problem, according to the invention, the bottom trough of the housing has a recess in the area around the coupling surface with the machine frame for achieving damping vibrations, which recess has a fixed range of damping legs. As a slit that surrounds the machine frame and the recess extends along the machine frame in the bottom trough in front of or behind the machine frame.

Achieving vibration damping can basically be achieved, for example, by fitting an elastic material, for example in the form of a damping damper, in the intermediate range between the housing and the machine frame.
This approach in particular creates an improvement over the known art, but has the disadvantage that it usually does not allow a true integration of the machine frame and the housing.

Due to the recesses provided around the coupling surface between the bottom trough of the housing and the machine frame, the cross section for sound conduction in the housing is reduced in the introduction range from the machine frame, i.e. the sound conduction resistance is reduced. .

The recesses can basically be formed, for example, by a range of reduced thickness of the housing bottom.

In the simplest case, the recess is formed around the connecting surface between the housing and the machine frame, in particular as a slit, which encloses the fixed area of the damping leg.

Thereby, the transmission of sound is completely blocked in the range where the slit is cut. Thus, a tongue is formed which is exclusively connected with the housing or the bottom trough along a relatively short section. As long as the damping legs are arranged below the tongue, in this way the vibrations of the machine frame are substantially taken up by the damping legs and no longer introduce only a very small part of the vibrations mainly into the housing. be able to.

In order to allow trouble-free transfer and sufficient stability of noise despite the recesses or slits provided according to the invention, the housing and / or the machine frame have necks or undercuts on both sides of the recesses. Have a rigid restraint clamp insertable into this neck.
When the restraint clamp is inserted, the tongue of the housing created by the recess can only oscillate upwards or downwards with limited amplitude.

Conveniently, the restraining clamp is U-shaped and the undercut portion is formed by the hook shoulder. A particularly positive restraint is achieved when the hook shoulders provide undercuts on two opposite sides of the housing recess or on the machine frame, the U-shaped bottom of the corresponding U-shaped restraining clamp then being provided. Engages the undercut portion of the machine frame and the U-shaped leg of the restraining clamp engages the undercut portion of the housing. The hook shoulders forming the undercuts are then oriented to point away from their respective recesses.

The restraint clamp having a locking shoulder ensures that it can be locked when inserted and avoids unintentional loosening during transport or during use. Due to the inherent elasticity of the restraint clamps made of plastic, for example, some elastic deformation is possible when locked.

As an alternative to the substantially U-shaped, self-elastic constraining clamp, the constraining clamp can also be formed as an elastic O-ring.

In order to ensure that the recess formed as a slit does not allow sound to enter on its side, and at the same time to prevent the ingress of mud, a sealing strip made of rubber-like elastic material is fitted in the recess. Can be inserted to fit.

In order to avoid a separate damping leg, at least one part of the sealing strip can additionally have a neck forming a leg that extends horizontally below the bottom trough. Correspondingly, therefore, these sealing strips have, for example, an L-shaped profile, the L-shaped legs extending along the underside of the bottom trough.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to an embodiment of the printer 1 shown in the drawings.

The printer 1 has a machine frame 2 and a housing that substantially contains a bottom trough 3. The machine frame 2 is formed in a conventional manner with the devices provided therein and is therefore only shown schematically. The bottom trough 3 rests on a damping leg 4, which is likewise known per se.

In order to reduce the transmission of sound from the machine frame 2 to the large surface of the bottom plate 3, the housing and the machine frame 2
Slits 5 are provided around the area of the damping leg 4 in the area around the coupling surface between the slits and these slits form a tongue 6 in the area of the damping leg 4.

A connecting portion 7 for connecting the tongue 6 to the remaining bottom trough 3
Guarantees sufficient strength when the sound lead resistance is high.

In order to avoid too noisy amplitudes and to protect such a printer 1 during transport, FIGS.
A device is provided which will be described in detail in connection with the figures.

In the embodiment shown in FIGS. 2 to 4, the bottom trough 3 adjoins the slit 5 and has a neck 8 with a hook 9, which hook 9 is formed on the neck 8 on its upper side and has a slit. It extends away from 5. Accordingly, a substantially U-shaped restraining clamp 11 having a U-shaped leg 12 and a U-shaped bottom 13 as well as a locking shoulder 14 formed at the free end of the U-shaped leg 12 is provided for the transition between the machine frame 2 and the bottom trough 3. Restraint clamps by being able to slide over a range
11 has its U-shaped bottom 13 under one hook 9 and its U
Since the shaped legs 12 engage under the other hook 9 on both sides of the slit 5, the restraining clamp 11 ensures that the relative movement between the machine frame 2 and the bottom trough 3 is in a pregiven range, especially in the vertical direction. Only possible.

Instead of the restraint clamp made of intrinsically elastic material shown as an example, a rubber or plastic O-ring can be wrapped around the hook-shaped shoulder,
The O-ring is then likewise tongue 6 and bottom trough 3
Creates an elastic bond with the rest of the.

6 and 7 show the recess 5 into which the sealing strip 12, which in the exemplary embodiment is L-shaped, is inserted. By inserting and fixing the first L-leg 13 in such a way that it fits in the recess 5 and sealing it, the penetration of sound and on the other hand the ingress of dirt is avoided. The other L leg 14 extends along the underside 15 of the bottom trough 3 and at the same time serves as a stand leg or stand strip as a substitute for the damping leg 4.

[Brief description of drawings]

1 is a schematic perspective view of a printer according to the present invention along a cut bottom trough, FIG. 2 is a plan view of the bottom trough for specifically explaining the extension of the recess, and FIG. 3 is a restraint. Fig. 4 is a perspective view of the arrangement of the clamps, Fig. 4 is a plan view corresponding to Fig. 3, Fig. 5 is a sectional view corresponding to Fig. 4 along the upper side of the restraint clamp, and Fig. 6 is inserted into a recess. FIG. 7 is a partial perspective view from below, showing the sealing strip, FIG. 7 is a sectional view in the area of the bottom trough with the sealing strip inserted. 2 ... Mechanical frame, 3 ... Bottom trough, 4 ... Damping leg, 5 ... Slit, 8 ... Neck, 11,11a ... Restraint clamp

Claims (7)

[Claims] 1. A printing device such as a typewriter, printer or the like having a housing, in particular a mechanical frame integrated with the bottom trough of the housing, and having damping legs arranged below the bottom trough, wherein the bottom of the housing The trough (3) has a recess in the area around the coupling surface with the machine frame (2) to achieve the damped vibration, the recess (5) enclosing the fixed range of the damping leg (4). A printing device such as a typewriter, printer or the like, characterized in that the recess extends along the machine frame in the bottom trough (3) in front of or behind the machine frame (2). 2. The bottom trough (3) of the housing and / or the machine frame (2) has a neck (8) or undercut on both sides of the recess into which a restraining clamp (11, 11a) is inserted. It is possible, Claim 1 characterized by the above-mentioned.
Printing devices such as typewriters and printers. 3. The restraint clamps (11, 11a) are U-shaped, and the undercut portions are hook shoulder portions (9, 10; 9a, 10).
A printing device such as a typewriter or printer according to claim 2, which is formed by a). 4. The restraint clamp (11, 11a) is provided with a lock shoulder portion (1).
4. A printing device such as a typewriter or printer according to claim 3, characterized in that 5. A printing device such as a typewriter or printer according to claim 2, wherein the restraining clamps (11, 11a) are formed as elastic O-rings or the like. 6. The typewriter, printer, etc. according to claim 1, characterized in that a sealing strip (12) made of a rubber-like elastic material is inserted into the recess (5) so as to fit therein. Printer. 7. At least part of the sealing strip (12) has shoulders (L legs 14) forming legs that extend horizontally below the bottom trough (3). Printing devices such as typewriters and printers.