JPH0727119B2 - Drive for microscope cross table - Google Patents

Description

The invention relates to a drive of the type described in the preamble to the first claim.

2. Description of the Prior Art In the drive system known from DE 3037710, the drive connection between the operating knob and the table consists of a friction connection with a friction wheel and a friction track. In order to selectively and rapidly move the table, the friction wheel is lifted from a friction track assigned to the friction wheel by a pin acting on the friction wheel in the axial direction of the operating shaft, whereby the table moves freely. It will be possible.

However, this type of table adjustment has the disadvantage that the force exerted by the pin in the axial direction of the shaft has a slight effect on the adjusted table height, i.e. acts to change the table height. There is. By changing the table height like this,
The annoying result of loss of focus of the object under the microscope objective occurs. This does not always, but very often, requires a later focus.

OBJECT OF THE INVENTION The object of the invention is to eliminate the abovementioned disadvantages and to provide a drive of the type mentioned at the beginning such that the table can be decoupled without affecting the height adjustment of the table. is there.

Means for Solving the Problems The gist of the present invention for solving the above problems is described in the characterizing portion of claim 1.

Action According to the present invention, the first reciprocating carriage and the second reciprocating carriage are not disengaged from their driving members by the force acting in the height direction of the table, but rather the driving members (pinion / pinion /
The connection of the racks) remains the same, but the shaft supporting the pinion is moved particularly lightly by means of ball bearings, and furthermore the shaft can be braked by a member having a force acting in the neutral direction when fine adjustment is required.

As a result, the table (second carriage) can be moved lightly or hard to move by a force that does not affect the height adjustment of the table, and therefore the table can be moved by hand quickly over a large stroke.
It can also be finely adjusted by the operation knob.

Furthermore, by mounting the drive shaft of the carriage of the microscope on a ball bearing, the shaft can be easily rotated when it is moved by hand, and this allows the table to be easily moved.

Conventionally, fine-tuning of the microscope table requires the motorized device to be rather immobile in order to position the object under the objective lens carefully and above all in a long-lasting manner. In this case, the fact that the table can be easily adjusted by bearing the shaft on a ball bearing is rather troublesome. In other words, when the object is positioned, it will pass through the correct position, or the correct position obtained will be lost again by the simple movement of the table. The desired relative difficulty of movement of the transmission has been sought to be significantly improved by axial plain bearings using more or less thick grease. In other words, there was a prejudice in the technical field for supporting the drive shaft of the microscope in the ball bearing.

However, in the drive system of the present invention, this is not a problem, and the desired difficulty of movement of the shaft during fine adjustment is sought by special braking of the shaft. On the other hand, in the case of quick manual adjustment, the carriage can be easily moved, which requires a simple entrainment by the shaft and the operating knob, and this uses a ball bearing for the shaft. Achieve by.

EFFECTS OF THE INVENTION The advantages obtained by the present invention are, on the one hand, that the drive shaft is borne by ball bearings, so that the table can easily be moved by large stroke distances by hand, and on the other hand, the table can be moved. When making a fine adjustment, it is possible to selectively make it difficult to move by a special braking member.

Embodiment In the drawings, a first operation knob 1 and a second operation knob 2 are shown. The first operating knob 1 is fixedly fixed to the shaft 1a, and the pinion 1b is fixedly attached to the other end of the shaft. A sleeve 1c is fixedly fixed to the shaft 1a below the pinion 1b. By this,
First operation knob 1, shaft 1a, pinion 1b and sleeve 1c
Can rotate together as one unit.

The shaft 1a is inserted into the first hollow shaft 3. Hollow shaft 3
Is fixedly connected to the first carriage 4 of the microscope table at point 4a.

The second operating knob 2 is fixedly fixed to the second hollow shaft 2a at a point 2d, and the hollow shaft fixedly supports the pinion 2b. This allows the second operating knob 2, the hollow shaft 2a and the pinion 2b to rotate together as a unit.

Both shafts 1a; 2a are each bearing in two ball bearings 1a ';2a', which make it possible to rotate the shafts particularly easily. The pinion 2b meshes with a rack 5 which is fixedly mounted on a stationary component 6 of the microscope table.
The pinion 1b meshes with a rack 7 which is fixedly mounted on a second carriage 8 of the table. The stationary component 6 of the microscope table, the first carriage 4 and the second carriage 8 are arranged with respect to one another in a conventional manner, i.e. the first carriage 4 is in the longitudinal guide at the first coordinate X. Slides relative to the stationary component, and in this case the second carriage 8
Support. The second carriage 8 slides in the longitudinal guide at the second coordinate y relative to the first carriage 4. Such an arrangement is generally known and therefore these components are shown only in cross section in the drawings.

The operation of these components is as follows: When the second operation knob 2 is rotated, the pinion 2b rolls along the rack 5. In this case both carriages move together in one coordinate direction and moreover perpendicular to the drawing plane of FIG. In this case, only the rack 5 and the component 6 remain stationary. All component groups and both carriages are held on the stationary component 6 of the microscope table by means of the longitudinal guides of the first carriage 4, said longitudinal guides usually consisting of two ball-guide strips.

However, when the first operating knob 1 is rotated, the first carriage 4, the second operating knob 2 and the pinion 2b remain unmoved. In this case, the rack 7 and the second carriage 8 fixed thereto together with the rack 7 are moved in the coordinate direction of arrow A, and the second carriage 8 is in the vertical guide, usually two balls. Sliding on the first carriage 4 in the guide strips.

The component embodying the invention consists of a first braking ring 10, a second braking ring 11 and a U-shaped block 12, the legs of which are themselves U-shaped and the leg 12a. ′, 12a ″ as well as 12b ′, 12b ″, in which case the leg 12b ″ is shown only in FIG.

The braking rings 10, 11 are slitted and therefore tend to be elastic with respect to each other. Braking ring 10 is shaft 1a
It is covered with a sleeve 1c that is fixedly connected with,
On the other hand, the braking ring 11 is covered on the hollow shaft 2a. Both brake rings have legs 12a ', 12a "or 12
As can be seen from FIG. 1, b'and 12b "are in contact with each other by one inclined surface.

The block 12 is supported by a pin 13 which projects through a hole 14 in the base of the block 12. The pin 13 is screwed into a part of the first carriage 4 at the end opposite to the end protruding from the base. The hole 14 is formed as a threaded hole, and the threaded sleeve 15 is screwed into the threaded hole. The pin 13 therefore engages the threaded sleeve 15 in a penetrating manner. The threaded sleeve 15 is chamfered on both sides on the outside (FIG. 1) so that the threaded sleeve can be screwed into the block 12 to a greater or lesser degree by means of a suitable locking wrench for adjustment. it can.

A pin 13 carries at its outer end a swiveling lever 16 which can swivel on the pin 13 about an axis 17. The swivel lever is located first on the side facing the threaded sleeve 15.
Has a work surface 16a and a second work surface 16b, and the distances a and b perpendicular to the center point of the shaft 17 of these work surfaces have different lengths, and Is larger than the interval b.

The mode of operation of these components is as follows: At the position of the swiveling lever 16 shown in FIG. 2, the first working surface 16a having a relatively large distance a from the center point of the shaft 17 has a threaded sleeve 15. , Which in turn acts on block 12. The block legs 12a ', 12a ", 12b', 12b" move in the direction towards the braking rings 10, 11 and the inclined faces of the block legs compress the braking ring. Therefore, each braking ring grips the shaft to which it is attached with a certain degree of firmness and provides a certain degree of braking against rotation of this shaft. Despite such braking or tightening, fine adjustment movement of the carriage is possible if the shaft and with it the pinion are still rotated by the operating knob. Therefore, such a position of the pivoting lever is necessary for fine adjustment of the object under the microscope objective.

On the other hand, when the swivel lever 16 is swung to the position B indicated by the alternate long and short dash line, the second work surface 16b acts on the threaded sleeve 15 and thus on the block 12. This working surface 16b has a relatively short distance b from the center of the axis 17 so that the entire block 12 can move with the legs in a substantially rightward direction in FIG. In this case, legs 12a ', 12a ", 12b', 12
The b ″ releases the brake rings 10,11, ie the brake rings open and push the block 12 back due to the stresses present in it.

In such a position the shafts 1a, 2a are free and can therefore no longer be braked or clamped. After this, the carriage is free to move and can be moved freely by hand, for example by grasping the second carriage 8 and the upper surface of the microscope table being a unique mounting surface and thus a mounting for an object. Both carriages can easily be moved in all coordinate directions via the upper carriage forming a surface. In this case, the pinion, the shaft and the operating knob are freely rotated together. In this way, large adjustment strokes can easily be carried out manually, whereas a separate adjustment knob is used to make fine adjustments when the table is brought at least close to the desired position. Adjustments are made.

As can be seen from the above description, the braking or releasing of the drive coupling member is not completely obtained in the radial direction, as is the case with conventional drive coupling members, rather than being obtained by a force affecting the table height position. Acting on the shafts 1a, 2a, and therefore the table position is obtained by braking or clamping forces which have little influence in the three coordinate directions.

[Brief description of drawings]

FIG. 1 is a perspective view of a driving device according to the present invention, and FIG. 2 is a longitudinal sectional view of the driving device. 1 ... 1st operation knob, 1a ... Shaft, 1a '... Ball bearing,
1b ... pinion, 1c ... sleeve, 2 ... second operation knob, 2a ... second hollow shaft, 2a '... ball bearing, 2b ... pinion, 2d ... location, 3 ... first Hollow shaft, 4 ... 1st
Carriage, 4a ... location, 5 ... rack, 6 ... components, 7 ... rack, 8 ... second carriage, 10 ... first braking ring, 11 ... second braking Ring, 12 …… Block, 12a ′, 12a ″, 12b ′, 12b ″ …… Leg, 13 …… Pin, 14
...... hole, 15 ...... sleeve with thread, 16 ...... swivel lever, 16
a: first work surface, 16b: second work surface

Claims (8)

[Claims] 1. In two linear guides, one drive coupling member each between the first carriage and the stationary table member and between the first carriage and the second carriage. A driving device for a cross table of a microscope movable in two coordinate directions, the driving device having two coaxially supported shafts, one operating end at each end. A knob is fixed, the drive coupling member has two pinions, one of each of the pinions being fixed to each of the shafts and to a stationary table member or a second carriage. In a type that is engaged with each of the provided racks and is provided with a release device for releasing the drive device for quick movement adjustment of the carriage, (a) the release devices are respectively For axis (1a; 2a) Braking jaws (10; 11) and each of the brake jaws (10; 1
1) has a tightening member (12; 12a '; 12a ";12b';12b"), and the braking jaws (10; 11) are each elastically cut at one position in the circumferential direction. A ring, which is covered by the associated shaft (1a; 2a) and can be operated in the open and braking positions on the associated shaft, said ring also opening the associated shaft In the position, it is released for easy rotation and in the braking position for braking so as not to rotate easily.
2; 12a '; 12a ";12b';12b") respectively through the operating members (16) supported by the first carriage (4) and the shaft (1a; 2
If it is formed as a U-shaped component movable vertically with respect to a) and the tightening member is moved,
U-shaped leg of the fastening member (12a '; 12a ";12b';12b")
The slitted ring (10; 11) is compressed or released, and the (b) shaft (1a; 2a) is supported in the ball bearing (1a ';2a'). This results in the shaft (1a; 2a) in the open position
A drive for a cross table of a microscope, characterized in that it can be rotated particularly easily. 2. The U-shaped tightening member (12; 12a '; 12).
a ″; 12b ′; 12b ″) are connected to each other by a traverse, the fastening member cooperates with the traverse to form a U-shaped block (12), and an operating member (16) for the fastening member is further provided. 2. The drive device according to claim 1, which acts on the block (12). 3. The operating member is formed as a swivel lever (16), which swivel lever is fixed to a pin (13) supported on a first carriage (4) and has two operations. Surface (16a; 16b), the working surface of which is the swivel lever (1
2. A drive device according to claim 1, wherein the drive levers have different spacings (a; b) with respect to the shaft (17) of 6) and the swiveling lever acts on the block (12) by means of a working surface. 4. The block (12) is provided in the block (12).
4. The drive device according to claim 3, further comprising an adjusting member attached for adjusting a distance between the swivel lever (16) and a work surface. 5. The adjusting member is formed in the block (12) as a threaded sleeve (15) which can be screwed to a greater or lesser degree, and a pin (13) extends through the threaded sleeve. The drive device according to claim 4, wherein 6. The drive system according to claim 1, wherein the braking jaws (10; 11) are made of plastic. 7. Drive device according to claim 1, characterized in that the braking jaws (10; 11) are slit at a plurality of points and are held by springs. 8. The drive device according to claim 1, wherein the braking jaws (10; 11) have an outer shape different from the circular shape.