JPH0894896A - Guide shaft fixing structure for moving member - Google Patents

Abstract

PURPOSE: To provide guide shaft fixing structure for a moving member capable of being easily worked, making a space incorporating a guide shaft small and fixing the guide shaft without backlash. CONSTITUTION: A bending piece 56 is formed at the left end of a fixed plate 54, and a plate-like supporting piece 58 is erected near the right end of the fixed plate 54. A hole part 60 in which a small-diameter shaft 30A formed at the left end of the guide shaft 30 is fitted is formed nearly in the center part of the bending piece 56. A V-groove 62 in which the right end 30B of the guide shaft 30 is placed is formed on the supporting piece 58. A countersunk head screw 66 is screwed in a screw hole 64 formed on the right end face of the fixed plate 54 and the edge part 30C of the right end 30B of the guide shaft 30 is pressed to the V-groove 62 by a tapered surface 68A formed at the top part 68 of the screw 66.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide shaft fixing structure for a moving member, and more particularly to a mirror applied to a photo film printing device, a film image input device, a zoom lens device, and the like.
The present invention relates to a guide shaft fixing structure for a moving member such as a lens.

[0002]

2. Description of the Related Art In a photo film printing apparatus, the exposure amount of a negative film frame is measured in advance before printing, and the exposure amount at the time of printing is set for each frame based on the measured exposure amount. The mechanism is such that a reflecting mirror, which is a moving member, is advanced to the optical axis of the transmitted image light of the negative film irradiated by the light source, and the transmitted image light is guided to the light amount measurement sensor by the reflective mirror. Also, when the light quantity measurement is completed,
The reflecting mirror is moved back again.

The reflecting mirror is supported by a guide shaft so as to be capable of reciprocating within the range on the optical axis of the transmitted image light from the home position, and reciprocating within the range by a lead screw driven by a stepping motor. To be done. That is, when a signal of a predetermined number of pulses is output to the stepping motor to drive the stepping motor, the reflecting mirror stops from the home position position to a predetermined position on the optical axis.

By the way, the guide shaft is fixed to a fixed plate 1 shown in FIG. Bending pieces 2 and 3 are formed at both ends of the fixed plate 1, and the bending piece 2 at the left end thereof is
A hole 2A into which the left end 4A of the guide shaft 4 is fitted is formed, and a hole 3A into which the guide shaft 4 is inserted is formed in the bent piece 3 at the right end. The guide shaft 4 is inserted from the hole portion 3A of the bent piece 3 with the left end portion 4A of the guide shaft 4 as a head, as shown by the chain double-dashed line in the figure, and
After fitting the left end 4A into the hole 2A of the bent piece 2, the E-ring 5 is provided between the left end 4A of the guide shaft 4 and the bent piece 2, and between the right end 4B and the bent piece 3. When inserted, it is retained and fixed to the fixed plate 1.

On the other hand, also in the moving lens of the zoom lens device, the above-mentioned fixed structure of the guide shaft is adopted.

[0006]

However, in the conventional guide shaft fixing structure of the moving member, the positional accuracy of the hole 2A and the hole 3A supporting the guide shaft 4 and the runout accuracy must be processed with high accuracy. Since it becomes impossible to fix the guide shaft 4, there is a drawback that it is difficult to process the holes 2A and 3A.

Further, in the guide shaft fixing structure, since the guide shaft 4 must be inserted through the hole 3A of the bending piece 3, there is an assembling space outside the bending piece 3 that is longer than the axial length of the guide shaft 4. It has the drawback of being required. Further, in the guide shaft fixing structure, since the E rings 5 and 5 are provided on both sides, there is a possibility that the guide shaft 4 is loosened in the axial direction, and the looseness causes the position of the moving member to be displaced. .

The present invention has been made in view of the above circumstances, and provides a guide shaft fixing structure for a moving member which is easy to process, has a small space for installing the guide shaft, and can fix the guide shaft without play. The purpose is to provide.

[0009]

In order to achieve the above object, the present invention provides a guide shaft fixing structure for movably supporting a moving member within a predetermined range. A hole into which one end of the guide shaft is fitted is formed in one end of the member, and a V groove in which the other end of the guide shaft is placed is formed in the other end of the fixing member. A screw member is screwed in the vicinity of the other end of the guide shaft mounted on the guide shaft in a direction orthogonal to the axis of the guide shaft, and one of the tapered surfaces between the top of the screw member and the other end of the guide shaft is tapered. The guide shaft is fixed to the fixing member by pressing the other end of the guide shaft to the V groove portion via the.

[0010]

According to the invention described in claim 1, one end of the guide shaft is fitted into the hole formed at one end of the fixing member, and the guide shaft is inserted into the V groove formed at the other end of the fixing member. Placing the other end, screwing a screw member near the other end of the guide shaft placed in the V groove, and pressing the other end of the guide shaft to the V groove at the top of this screw member. The guide shaft is fixed to the fixing member by. At this time, since the guide shaft is pressed through one of the tapered surfaces between the top of the screw member and the other end of the guide shaft, the other end of the guide shaft is divided by the component force of the force of the tapered surface. Is pressed into the V-groove, and one end of the guide shaft is pressed into the hole. Thereby, in the present invention, the guide shaft can be fixed to the fixing member without backlash.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a guide member fixing structure for a moving member according to the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a structural diagram showing an embodiment in which a guide shaft fixing structure for a moving member according to the present invention is applied to a photographic film printing apparatus.

In the main body 10 of the photographic film printing apparatus shown in FIG. 1, an insertion port 14 for a developed negative film 12 is formed on the side surface thereof. A light source 16 for irradiating the negative film 12 is installed above the negative film 12 inserted from the insertion opening 14. Below the light source 16,
A moving mechanism 20 for the reflection mirror 18 described below is provided, and a projection lens 22 is installed below the moving mechanism 20. The projection lens 22 is installed on the optical axis 24 of the transmitted light of the negative film 12, and the transmitted light can be projected on the photographic paper 26 set below the main body 10. As a result, the photographic image of the negative film 12 is printed on the photographic printing paper 26.

The moving mechanism 20 of the reflection mirror 18 is a frame member 28 that is a moving member holding the reflection mirror 18, a guide shaft 30 that supports the frame member 28 in a reciprocating manner, and a frame member 28.
The actuator 32 is attached to the stepping motor 34, the stepping motor 34 for moving the frame 28, and the like. The reflection mirror 18 is fixed to the frame body 28 at a position that reflects the transmitted image light 90 degrees to the right when positioned on the optical axis 24 as shown by the solid line in FIG. The brightness of the transmitted image light reflected by the reflection mirror 18 is measured by a light amount measuring sensor 36 installed on the extension thereof.

The frame 28 has a pin 3 formed at the bottom thereof.
8 is engaged with the recess 42 of the moving piece 40, and the moving piece 40 is screwed to the lead screw 44 directly connected to the stepping motor 34. The lead screw 44 is arranged parallel to the reflection optical axis 46 of the transmitted image light reflected by the reflection mirror 28. The stepping motor 34 is driven and controlled by a signal having a predetermined number of pulses output from the pulse oscillation circuit 48, and the pulse oscillation circuit 48 is driven by a power supply 50 that is driven / stopped by turning on / off an external switch 49. To be done. Therefore,
When the external switch 49 is turned on to turn on the power supply 50 and the pulse oscillation circuit 48 outputs a predetermined number of pulse signals to the stepping motor 34, the driving force of the stepping motor 34 causes the lead screw 44 to rotate. When the lead screw 44 rotates, the moving piece 40 is guided by the guide shaft 30 and moves along the lead screw 44, so that the frame 28 slides in parallel with the reflected light axis 46 of the transmitted light through the moving piece 40. To do.

A micro switch 52 (or a photo interrupter 52) which is a home position sensor is provided on the moving path of the frame 28. The micro switch 52 is installed at a position where it can come into contact with the right end portion 32A of the actuator 32, and when the actuator 32 comes into contact with it, the power supply 50 is turned off. As a result, movement of the frame body 28 by the stepping motor 34 is stopped,
The stopped position (the position indicated by the chain double-dashed line in FIG. 1) is the home position of the frame body 28. In addition, the frame 28
Is moved leftward in the drawing from the home position by the stepping motor 34, and the pulse oscillation circuit 4
8 stops at a position corresponding to a predetermined number of pulse signals output from the stepping motor 34, that is, at a position on the optical axis 24.

Next, the fixing structure of the guide shaft 30 will be described. The guide shaft 30 is fixed to a fixed plate 54 fixed to the main body 10 of the photo film printing apparatus. As shown in FIG. 2, the fixed plate 54 has a bent piece 56 formed at its left end and a plate-shaped support piece 58 provided upright in the vicinity of its right end. The bent piece 5
A hole portion 60 is formed at a substantially central portion of 6, and a small diameter shaft 30A formed at the left end portion of the guide shaft 30 is fitted into the hole portion 60. A V groove 62 is formed in the support piece 58 as shown in FIG. 3, and the right end portion 30B of the guide shaft 30 is placed in the V groove 62. Regarding the hole 60 and the V groove 62, the small diameter shaft 30A of the guide shaft 30 is fitted into the hole 60, and the right end portion 30B of the guide shaft 30 is inserted into the V groove 6.
The guide shaft 30 is formed at a position parallel to the reflection optical axis 46 when the guide shaft 30 is mounted on the second optical axis.

Further, as shown in FIG. 2, a screw hole 64 is formed on the right end surface of the fixed plate 54 and at a position corresponding to the lower side of the right end portion 30B of the guide shaft 30. A countersunk screw 66 is screwed into the screw hole 64. When the flat head screw 66 is screwed into the screw hole 64, the right end portion 30B of the guide shaft 30 is
The edge portion 30C is pressed against the V groove 62 by the tapered surface 68A formed on the top portion 68 of the flat head screw 66.

Therefore, the guide shaft 3 constructed as described above
According to the shaft fixing structure of 0, the left end portion 30A of the guide shaft 30
Is supported by the hole portion 60 of the bending piece 56, and the right end portion 30B of the guide shaft 30 is supported by the V groove 62 of the supporting piece 58. Therefore, both end portions 4A, 4B of the guide shaft 4 are bent. As compared with the conventional guide shaft fixing structure (see FIG. 5) which is supported by the three holes 2A and 3A, the hole 60 and the V groove 62 do not require high processing accuracy, which facilitates the processing. .

Further, in the guide shaft fixing structure of the present embodiment, the guide shaft 30 is placed and fixed in the V groove 62, so that the guide shaft 4 is inserted from the hole 3A of the bending piece 3 in the prior art. The space for incorporating the guide shaft 30 can be reduced as compared with the guide shaft fixing structure (see FIG. 5). Further, in this embodiment, the guide shaft 30 is fixed by utilizing the tapered surface 68A of the flat head screw 66, so that the component force of the force by the tapered surface 68A acts. That is, the right end portion 30B of the guide shaft 30 is pressed against the V groove 62 by the component force in the downward direction, and the left end portion of the guide shaft 30 is pressed against the bending piece 56 by the component force in the axial direction. The shaft 30 can be fixed to the fixing plate 54 without backlash.

In this embodiment, the countersunk screw 66 is used to guide the guide shaft 30.
However, the present invention is not limited to this. For example, as shown in FIG. 4, the right end portion 3 of the guide shaft 30 is fixed.
The tapered surface 30D is formed at the edge of 0C, and the tapered surface 3
The same effect can be obtained by pressing the edge 72A of the top 72 of the pan screw 70 to 0D. Also,
In the present embodiment, the guide shaft fixing structure of the moving member applied to the photo film printing apparatus is described, but the present invention is not limited to this, and a film image input device for recording a film image on a tape, a magnetic disk or the like, You may apply to a zoom lens apparatus etc.

[0021]

As described above, according to the guide shaft fixing structure of the moving member according to the present invention, one end of the guide shaft is fitted into the hole formed at one end of the fixing member, and the other of the fixing member is fixed. Place the other end of the guide shaft in the V groove formed in the end,
Then, a screw member is screwed into the vicinity of the other end portion of the guide shaft placed in the V groove portion, and the guide shaft is pressed through one of the tapered surfaces between the top of the screw member and the other end portion of the guide shaft. With this configuration, the other end of the guide shaft is pressed against the V groove and the one end of the guide shaft is pressed against the hole by the component of the force of the tapered surface. As a result, in the present invention, the processing is facilitated, the space for incorporating the guide shaft can be reduced, and the guide shaft can be fixed without play.

[Brief description of drawings]

FIG. 1 is a structural view showing an embodiment in which a guide shaft fixing structure for a moving member according to the present invention is applied to a photographic film printing apparatus.

FIG. 2 is a structural view showing an embodiment of a guide shaft fixing structure for a moving member according to the present invention.

FIG. 3 is a cross-sectional view of the guide shaft fixing structure of the moving member viewed from the line 3-3 in FIG.

FIG. 4 is an enlarged view of an essential part showing another embodiment of the guide shaft fixing structure of the moving member according to the present invention.

FIG. 5 is an explanatory view showing an embodiment of a conventional guide shaft fixing structure for a moving member.

[Explanation of symbols]

 10 ... Photo film printing apparatus main body 18 ... Reflecting mirror 20 ... Reflecting mirror moving mechanism 28 ... Frame 30 ... Guide shaft 32 ... Actuator 34 ... Stepping motor 44 ... Lead screw 54 ... Fixed plate 56 ... Bending piece 58 ... Support Piece 60 ... Hole 62 ... V groove 66 ... Flat head screw

Claims (1)

[Claims] 1. A fixing structure of a guide shaft for movably supporting a moving member within a predetermined range, wherein a hole portion into which one end of the guide shaft is fitted into one end of a fixing member for fixing the guide shaft. And a V groove portion in which the other end portion of the guide shaft is mounted is formed in the other end portion of the fixing member, and a screw member is provided in the vicinity of the other end portion of the guide shaft mounted in the V groove portion. Is screwed in a direction orthogonal to the axis of the guide shaft, and the other end of the guide shaft is connected to the other end of the guide shaft through the tapered surface between the top of the screw member and the other end of the guide shaft.
A guide shaft fixing structure for a moving member, characterized in that the guide shaft is fixed to a fixing member by being pressed against a groove.