JPS581778Y2 - Slide magazine feeding mechanism in automatic slide projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of the slide magazine feeding mechanism in an automatic slide projector in which a feeding claw is actuated using the reciprocating motion of a slide loading/unloading arm.

Various slide magazine feeding mechanisms of this type have been developed and used in the past, but the mechanism described in Japanese Utility Model Application Publication No. 53-24631, for example, has the following drawbacks.

That is, the feed mechanism of this slide magazine had a structure in which two feed pawls were symmetrical in shape, and the tips of these pawls were crossed vertically close to each other. If there is a minute dimensional error in each part or the spacing between the parts, interference between the two feed claws will occur, causing trouble in operation, and as a result, troubles such as the engagement of each claw with the magazine rack teeth may occur. It was easy to do.

However, this had the disadvantage of requiring particularly precise machining and adjustment.

In view of the above-mentioned problems, the present invention aims to provide a slide magazine feeding mechanism that can simplify the structure, ensure reliable operation, and facilitate assembly work by having only one feeding claw. An embodiment thereof will be described based on the drawings.

1 is a slide projector housing, 2 is a slide magazine 3 provided with rack teeth 2a along the bottom edge, and is A-B in the figure.
This is a slide loading and unloading arm that loads and unloads the slide 4 in the slide magazine 2 by reciprocating movement in the direction, and pins 5 are fixed to two parts of the lower connecting culm 3a of the slide loading and unloading arm 3. .

Reference numeral 6 denotes a feed pawl made of a thin plate, and as shown in FIG. A pawl 6a is provided, and an oval hole 6b whose longitudinal length is approximately twice as long as the bit of the rack tooth 2a is bored at the other end.

Reference numeral 7 denotes a thick cam plate fixed to the inside of the U-shaped portion of the feed pawl 6 with screws, etc., as shown in FIG.
Two symmetrical protrusions 7a are provided at the end on the slide magazine 2 side, and four inclined surfaces at approximately 45° with respect to the A-B direction are provided on the back surface (the inner surface of the protrusion 7a is also include)
and a gap such that the pin 5 can easily pass through.

Reference numeral 8 denotes a guide lever for switching forward and backward, and as shown in FIG.
Oval holes 8 a t 8 b, which are approximately four times the pitch of a, are bored, and can be slid in a direction perpendicular to the A-B direction using stepped screws 9° and 10 on the floor surface of the housing 10. installed.

Note that there is a feed pawl 6 above the left oval hole 8a of the guide lever 8.
are mounted one on top of the other by a common stepped screw 9,
The feed pawl 6 is capable of sliding and rotating independently.

The position of the stepped screw 9 is such that the center of the claw 6a of the feed claw 6 is at the pin 5.
It is selected so that when it comes to the top of the trajectory, it is located in the middle of the oval hole 6b.

An arm portion 8c formed by bending one end of the guide lever 8 to the outside of the housing 1 has a switching lever 11 fixed thereto, and an arm portion 8d extending inside the housing 1 has a sliding portion 8c of the guide lever 8. A line spring 12 is applied to hold the position at both extreme extreme positions.

The other end of this wire spring 12 is fixed to a part of the floor surface of the housing 10, and the wire spring 12 crosses the dead center at the center of the sliding movement of the guide lever 8, and moves in opposite directions at both extreme sliding positions. It exerts a biasing force and acts to hold the guide lever 8 in that position.

13 and 14 are spring hanging holes drilled at both ends of the U-shaped portion of the feed pawl 6 and elongated holes 8e and 8f bored at both ends of the upright wall portion of the guide lever 8, respectively. It is a suspended coil spring that always pulls the feed pawl 6 in one direction, left or right, by either tension, and always pulls the feed pawl 6 clockwise with the stepped screw 9 as a fulcrum by either component of force. The guide lever 8 is biased against the upright wall of the guide lever 8.

Note that the elongated holes 8e and 8f of the guide lever 8 are
The springs 13 and 14 are longer in the longitudinal direction, and when the springs 13 and 14 are about to be compressed by sliding the guide lever 8, the ends of the springs 13 and 140 on the guide lever 8 side are released so that the feed claws 6 spring 13,
14 pressure force etc. cannot be applied.

Reference numeral 15 denotes an L-shaped restriction plate fixed on the floor of the housing 10 closer to the slide magazine 2 than the cam plate 7 such that its position can be adjusted in the A-B direction, and limits the movement distance of the cam plate 7 in the A direction. By doing so, the depth of engagement of the claw 6a with the rack tooth 2a can be adjusted.

Next, the operation of the present device will be explained.

First, the feeding operation of the magazine 2 will be explained. In a steady state, the slide loading/unloading arm 3 is in the position where the slide 4 is inserted into the optical path, so the pin 5 is in the position shown in FIG.

At this time, it is assumed that the guide lever 8 is in a position for advancing the slide magazine 2, that is, in the extreme left position in FIG.

Then, due to the difference in size between the oval hole 6b of the feed pawl 6 and the oval hole 8a of the guide lever 8, the pawl 6a of the feed pawl 6 is positioned to the left by one pitch of the rack teeth 2a with respect to the trajectory t of the pin 5. I come to do it.

At this time, only the tension of the spring 13 acts on the feed claw 6.

Next, the slide loading/unloading arm 3 moves from A to B in the forward stroke.
When the slide 4 that had been inserted into the optical path is moved in the direction of A and stored in the magazine 2, the pin 4 is moved to
It moves in the direction of B and reaches the position indicated by the dotted line in FIG. 6, collides with the right side of the It begins to be pushed back, and then, after passing the X-shaped cam 1b, it reaches the ultimate position as shown in FIG. 1 and comes to rest.

During this time, the feed claw 6 is once moved to the right by the pin 5, but when the restraint by the pin 5 is released, it returns to its original steady state again.

Next, when the backward stroke of the loading/unloading arm 3 is started and the loading/unloading arm 3 moves from B to A, the pin 5 collides with the right side of the X-shaped cam 7b as shown in FIG. As a result, the feed pawl 6 is rotated counterclockwise while resisting the force of the spring 130, and the pawl 6a of the feed pawl 6 is engaged with the rack teeth 2a of the slide magazine 2.

At the same time as this meshing, the protrusion 7a of the cam plate 7 comes into contact with the restriction plate 15, and further rotation of the feed pawl 6 in the counterclockwise direction is inhibited, so that the depth of the meshing of the pawl 6a with the rack tooth 2a is reduced. is in an appropriate state.

Subsequently, as the pin 5 continues to move in the backward stroke, the feed pawl 6
is now pushed and slid to the right against the tension of the spring 13 along the restriction plate 15 as shown in FIG. urge

Thereafter, when the pin 5 passes through the center gap of the X-shaped cam 7b and separates from the cam plate 7, the feed pawl 6 returns to its normal state as shown in FIG. 6 due to the tension of the spring 13.

on the other hand. During the subsequent backward stroke, the loading/unloading arm 3 inserts a new slide 4 into the optical path and stops.

Thus, one stroke of frame feeding by this mechanism is completed, during which the magazine 3 is fed by one frame in the right direction, that is, in the forward direction.

Next, the switching operation of the feeding direction of the slide magazine 2 will be explained. In this case, in order to move the slide magazine 2 backward, put your finger on the switching operation knob 11 and move the guide lever 1 as shown in FIG. 10. It is sufficient to move it to the right extreme position.

That is, at this time, the feed pawl 6 is also moved to the right, and due to the difference in size between the oval hole 6b of the feed pawl 6 and the oval hole 8a of the guide lever 8, the pawl 6a of the feed pawl 6 moves along the trajectory l of the pin 5. It is located to the right by one pitch of the rack teeth 2a.

Also, at this time, the spring 13 loses its tension, and only the tension of the spring 14 comes to act on the feed pawl 6 instead.

Therefore, when the slide loading/unloading arm 3 moves, the pin 5 collides with the left side of the X-shaped cam 1b of the cam plate 7 in the forward stroke, contrary to the above case, and pushes the feed pawl 6. It passes while pushing away to the left while resisting the tension of the spring 14, and in the backward stroke it also collides with the left side of the X-shaped cam 7b, causing the feed pawl 6 to rotate counterclockwise and causing the pawl 6a to engage the rack tooth. 2a, and at the same time as this meshing, the protrusion 7a of the cam plate 7 comes into contact with the restriction plate 15, and the feed pawl 6
Further counterclockwise rotation of the pin 5 is inhibited, and the subsequent movement of the pin 5 in the backward stroke pushes the feed pawl 6 to the left and causes it to slide, eventually moving the slide magazine to the left, that is, in the backward direction. Move it one piece.

In the case of the above embodiment, the operating direction of the switching lever 11 and the moving direction of the slide magazine are opposite, which may create an illusion for the user and cause misuse. Such misuse can be avoided by interposing one culm between the operating knob 11 and reversing the movements of the two.

As described above, the slide magazine feeding mechanism according to the present invention has extremely superior advantages over the conventional example, such as simple structure, reliable operation, and ease of assembly.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an embodiment of the slide magazine feeding mechanism in the automatic convertible slide projector according to the present invention, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, Figs. FIG. 5 is a perspective view of the feed button, cam plate, and guide lever of the above embodiment, and FIGS. 6 to 10 are plan views showing each stage of the frame feeding process according to the above embodiment. 1...Slide projector housing, 2...Slide magazine, 2a...Rack teeth, 3...
...Slide attachment/removal arm 4...Slide, 5...Pin 6...Feed claw, 6a.
...Claw, 6b...Oval hole, T...
・Cam plate, 1a...Protrusion, 1b...X
Shape cam, 8...Guide lever 8a, 8b
...Oval hole, 8C28d...Arm, 8
et8f...Elongated hole, 9, 10...Stepped screw, 11...Switching operation knob, 12...
... wire spring, 13, 14 ... coil spring, 15 ... L-shaped restriction plate, t ...
...Trajectory.

Claims (1)

[Scope of utility model registration request] In an automatic slide projector that operates a feed pawl using the reciprocating motion of a slide loading/unloading arm, one end is provided with a pawl and an X-shaped cam, and the other end rotates and slides on the floor of the housing. The feed pawl is suspended between a feed pawl that is movably attached, a guide lever that is slidably attached to the floor of the housing, and the end of the feed pawl and both ends of the guide lever. Two springs pull the claw in one direction and force the feed claw into contact with the guide lever; A restriction plate that limits the rotation at an appropriate position is provided on the slide loading/unloading arm, and passes through the X-shaped cam while coming into contact with one side of the X-shaped cam, thereby rotating and sliding the feed pawl. The slide magazine is provided with a pin for moving the guide lever, and the slide magazine is advanced by -pitch by the initial movement of the return stroke of the slide loading/unloading arm by the cooperation between the pin and the feed pawl, and the position of the guide lever is adjusted. A feeding mechanism for a slide magazine, characterized in that the feeding direction of the feeding claw is changed by switching the side surface that the pin of the X-shaped cam comes into contact with.