JPH01276457A - Pinch roller driving mechanism - Google Patents

Abstract

PURPOSE:To decrease the number of parts in a driving mechanism and to cause the driving mechanism to be compact by revolving the main cam of a VTR, driving a pole moving, moving a pole, forming a tape pass, revolving a pinch roller cam and moving a pinch roller unit in the revolving shaft direction of the pinch roller cam. CONSTITUTION:When a tape cassette is charged and a motor 33 is driven, a main gear 26 is revolved through a worm gear 37 and a half loading pole 28 is moved by the revolution of a half loading gear 27 which is engaged with the gear 26. When a guide pole 30a is moved with accompanying the revolution of the gear 27 and the intermittent part of the gear 27 is loaded on the bank part of the gear 26, the operation of the half loading is stopped. Since the lead of a channel part 25b, which is spirally shaped in the upper direction of a pinch roller cam 25, is made small for a press lever 24 in the condition of this half loading, it is reduced that a pinch roller 22 falls down in a lower direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a pinch roller drive mechanism, and more particularly to a pinch roller drive mechanism for a VTR having a running system with an external capstan.

For example, as shown in FIG. 8, the tape path of the magnetic tape during recording and playback on a normal home VTR is as follows: from the supply reel to the impedance roller 2. It has a path in which it is wound around a rotary head 4 via a full-width erasing head 3, etc., passed through an audio/control head 5, held between a capstan 6 and a binge 0-rough, and wound onto a take-up reel 8. In addition, in order to simplify the mechanical structure of a normal VTR, a capstan 6 is provided inside the tape path, and a pinch roller 7 is provided outside the tape path. 6 and a pinch roller 7.

However, in a configuration in which the capstan 6 is provided inside the tape path and the pinch roller 7 is provided outside the tape path as shown in FIG. Although it is necessary to take a long tape bus with the reel 8, it is necessary to provide the capstan 6 near the take-up reel 80 for loading the magnetic tape, and the tape bus with the take-up reel 8 is shortened. Because of this, stable tape running cannot be achieved. In addition, since the capstan 6 needs to be installed at a position where it is inserted into the loading hole of the tape cassette, the upper space is limited, and as shown in Fig. Shaft 6 with bearings 6b and 6c
It is necessary to adopt a structure that receives a, and the capstan becomes large in the lower part of the tape, resulting in an increase in the size of the mechanism.

Therefore, as shown in FIG. 9, it is necessary to provide the capstan 6 on the outside of the tape bus and the pinch roller 7 on the inside of the tape bus.
It is necessary to provide a pinch roller drive mechanism that allows the tape to escape upward so as not to interfere with the tape.

Conventional technology FIG. 6 shows a perspective view of a conventional pinch roller drive gate structure.

In the figure, 9 is a pinch roller, 10 is a pinch roller arm,
Reference numeral 11 indicates an up/down lever, and 12 indicates an up/down cam.

In the conventional pinch roller drive mechanism, as shown in FIG. 6, driving force from a motor (not shown) is transmitted to a main gear 13, and is transmitted to a first cam gear 14 and a second cam gear 15 meshing with the main gear 13. communicated. The first cam gear drives a loading gear (not shown) and also drives the half-loading arm 15 to keep the tape in a loaded or half-loaded state.

Further, the second cam gear 15 drives a control plate that controls other mechanical parts by means of a cam part 15a, and also meshes with a gear part 15b and drives a relay gear 16.

The relay gear 16 has a first gear part 16a and a second gear part 16b coaxially, the first gear part 16a meshes with the gear part 15b of the second cam gear 15, and the second gear part 16
b meshes with the gear portion 12a of the pinch roller cam 12, and the second
The driving force from the cam gear 15 is transmitted to the pinch roller cam 12.

The pinch roller cam 12 is provided with a spiral groove 12b along the shaft 17. A protrusion 11a of an up-down lever 11 provided on a shaft 17 so as to be movable up and down is engaged with this groove 12b. Laminated on the upper part of the up-down lever 11 are a breath lever 19 and a pinch roller arm 10 to which a pinch row 59 is attached so as to be movable up and down on a shaft 18.

Therefore, as the pinch roller cam 12 rotates, the up/down lever 11 moves up and down along the shaft 17, and the pinch roller 9 also moves up and down.

The pinch roller cam 12 is provided with a cam portion 12c, which presses the arm portion 20a of the arm gear 20 rotatably fixed to the shaft 17 to rotate the arm gear 20. A gear portion 21b of a guide arm 21 provided with a guide pole 21a is engaged with a gear 20b of the arm gear 20, and the guide pole 21a is moved in accordance with the rotation of the pinch roller cam 12.

The rotation of the pinch roller cam 12 causes the up/down lever 11 to move downward, and when it is at the lowest position, the breath lever 18 contacts the protrusion 12d of the pinch roller cam 12 and rotates around the shaft 17. The pin 1'1b of the lever 11 engages with the arm gear 20, and the guide pole 21a is positioned. The breath lever 19 is engaged with the pinch roller arm 10, and the breath lever 19 is engaged with the pinch roller arm 10.
9 rotates the pinch roller arm 10 in a direction to press a capstan (not shown), thereby making it possible for the tape to run.

Problems to be Solved by the Invention However, the conventional pinch roller drive mechanism requires two tall shafts: one for the binge roller arm, press lever, up/down lever, etc., and the other for the pinch roller cam, etc., and requires a large space. In addition, a large number of shaft levers and gears were required, resulting in high costs, and the parts were arranged above and below the main deck, which caused problems such as troublesome assembly and reduced productivity.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a pinger roller drive embroidery mechanism that can be configured with a small number of parts and a small space.

Means for Solving the Problems The present invention provides a main cam gear having a main gear for transmitting driving force and a cam groove, and a pole moving means for moving a pole that meshes with the main cam gear and forms a tape path near the capstan. , a pinch roller cam having a gear part that meshes with a main cam gear and rotates according to the rotation of the main cam gear, and a groove part that is spirally provided around the rotation axis of the gear part and rotates together with the gear part, and a pinch roller. is locked, engages with the groove of the pinch roller cam, moves in the direction of the rotation axis as the pinch roller cam rotates, and engages with the cam groove of the main cam gear when the limit of movement is reached. and a pinch roller unit that rotates around a rotating shaft by rotation of a main cam gear and presses the pinch roller against the capstan.

When the main cam gear rotates, the pole moving means meshed with the main cam gear is driven to move the pole to form a tape path, and also rotates the pinch roller cam to move the pinch roller unit in the direction of the rotation axis of the pinch roller cam. do.

When the pinch roller unit reaches its limit of movement due to this movement, it engages with the cam groove of the main cam gear, and when the main cam gear rotates further, the pinch roller unit rotates around the rotation axis of the pinch roller cam and the capstan. Crimp.

Conventionally, the pinch roller cam was used to move the pinch roller unit up and down and press the pinch roller to the capstan, so the axes of the pinch roller cam and the pinch roller unit were different.However, according to the present invention, the axes of the pinch roller unit were different. The pinch roller unit is engaged with the cam groove of the main cam gear, and the pinch roller unit is rotated to press the pinch roller against the capstan, thereby aligning the axes of the pinch roller unit and the pinch roller cam. be able to.

Embodiment FIG. 1 shows a schematic perspective view of an embodiment of the invention. In the figure, 22 is a pinch roller, 23 is a pinch roller arm, 24
25 indicates a breath lever, and 25 indicates a pinch roller cam.

The main cam gear 26 has a first gear part 26a, a second gear part 26b, and a cam groove 26d, and the driving force from the motor 33 is transmitted by a worm gear 37 (see FIGS. 2 to 4M). First gear portion 26a of main cam gear 26
is engaged with the gear portion 25a of the pinch roller cam 25 and rotates the pinch roller cam 25. Further, the first gear portion 26a meshes with a half-loading gear 27, which is a pole moving means, to rotate two half-loading arms on which half-loading poles 28 are implanted. Similar to the half-loading gear 27 on which the guide pole 30a is installed, the gear portion 30b of the guide arm 30, which is a pole moving means, is engaged with the half-loading gear 27, so that the guide arm 30 moves with the rotation of the half-loading gear 27. No rotation.

As shown in FIG. 1(B), the first gear portion 26a of the main cam gear 26 and the half loading gear 27 that meshes with it are intermittent gears, and the half loading pawl 28 and the guide pawl 30a are configured to stop at a predetermined position. It is said that

The breather lever 24 is attached to the pinch roller cam 25 from above so that the claw portion 24a provided on the inside of the breather lever 24 and the groove portion 25b spirally provided on the pinch roller cam 25 along the shaft 31 engage with each other. . A claw portion 24d is also provided on the outside of the rear portion of the breather lever 24, and engages with a rail 39 provided with a rail 39 in the vertical direction (see FIGS. 2 and 3).

A pinch roller arm 23 provided with a pinch roller 22 is locked to the breath lever 24 by a claw portion 24b and a spring 32. Further, the breather lever 24 is provided with a pin 24C that is inserted into a cam groove 26c provided in the main cam gear 26 when the breather lever 24 descends to the lowest position along the shaft 31.

Next, the operation of this embodiment will be explained with reference to FIGS. 2, 3, and 4.

FIG. 2 shows the state before the tape is loaded, and the capstan roller 22 is positioned above the shaft 31, and the half loading pole 28 and guide pole 30a are also inserted with the tape cassette loading pole. It is located below the hole.

When the tape cassette is inserted, the motor 33 rotates. The driving force of the motor 33 is transmitted to a worm gear 37 via pulleys 34, 35 and a belt 36. The main cam gear 26 is meshed with the worm gear 37, and the main cam gear 26 starts rotating.

When the main cam gear 26 rotates, the half loading gear 27 meshed with the main cam gear 26 rotates and the half loading pole 28 moves, and as the half loading gear 27 rotates, the guide pole 30a moves. The half-loading operation is completed when the intermittent portion of the half-loading gear 27 climbs onto the bank of the main cam gear 26. FIG. 3 shows the state of the device during half loading. In this state, the lead of the spiral groove 25b above the pinch roller cam 25 of the breath lever 24 is cut small, so the pinch roller 22 moves downward only a little. Therefore, the pinch roller 22 does not interfere with the formation of a tape bus during half loading.

Next, when transitioning from the half-loading state to the normal loading state, by further rotating the main cam gear 26, the breath lever 24 moves in the groove 25b of the pinch roller cam 25, which has a large lead, so that it moves downward significantly. descend to At this time, the claw portion 24d of the press lever 24 is engaged with the rail 39 so that the press lever 24 does not rotate together with the pinch roller cam 25. When the press lever 24 descends to the lowest position, the pin 24G of the press lever 24 is connected to the main cam gear 2.
It is inserted into the cam fi26c of No. 6 and moves along the cam groove 26c. Since the bottle 26c is pressed outward from the center of the main cam gear 26 during movement, the press lever 24 rotates slightly. Therefore, the pinch roller arm 23 that is locked to the front lever 24 also rotates, and the pinch roller 22 is pressed against the capstan 38. Furthermore, rail 39
A rail is cut at the bottom of the press lever 24 so as not to interfere with the rotation of the press lever 24. This state is shown in FIG. This completes normal loading.

Note that by configuring the capstan 38 to be provided outside the tape bus as shown in this embodiment, there is no restriction on the space above the capstan shaft 38, so for example, as shown in FIG. It becomes possible to provide the bearings 39 and 40 above and below the capstan 41, and it is possible to easily withstand the pressing force from the pinch roller as shown by the arrow A. For this reason, the bearing 39.40 is made of oilless metal, which is cheaper than the pole bearing.

Can be configured with oil-impregnated bearings.

Effects of the Invention As described above, according to the present invention, by providing the main cam gear, the axes of the pinch roller unit and the pinch roller cam can be made the same, and the number of shafts can be reduced, so the mechanism can be simplified. Compared to the conventional type, the number of parts is smaller (for example, the number of parts of the conventional type shown in Fig. 6 is shirt 1-11 (large 2), sheet metal 1, molded product 10.
Pinch roller 1. The spring 4 has 27 points, whereas the first embodiment has a shaft 7 (large 1), a sheet metal 1. Molded product 5. Pinch roller 1. Only 17 points of spring 3 are required. ) configuration, it is possible to improve the reliability of the mechanism and reduce costs.It can also be configured to save space, and it is also possible to configure it so that parts are installed only on the top of the main deck, improving productivity. You can do the right features etc.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIGS. 2 to 4 are diagrams for explaining the operation, FIG. 5 is a sectional view of a capstan of an embodiment of the present invention, and FIG. 6 7 is a sectional view of an example of a conventional capstan, FIG. 8 is a diagram for explaining the tape path of a normal VTR, and FIG. 9 is a perspective view of an example of a conventional capstan.
The figure is a diagram for explaining the tape path of a VTR running system of a capstan device. 22... Pinch roller, 23... Pinch roller arm, 24... Press lever, 25... Pinch roller cam, 26... Main cam gear, 28... Half loading pole, 30a... Guide Pole. Patent applicant: Victor Japan Co., Ltd. 4゛゛τ゛-) Patent attorney: Kaneyuki Matsuura 1-1-1 Figure 2 (A) Figure 3 (A) @ Figure 4 (B) Figure 7 Figure 8 Figure 9

Claims (1)

[Scope of Claims] A main cam gear that has a main gear that transmits driving force and a cam groove, a pole moving means that meshes with the main cam gear and moves a pole that forms a tape path near the cab stan, and the main cam gear. A pinch roller cam has a gear part that meshes with a cam gear and rotates in accordance with the rotation of the main cam gear, and a groove part that is spirally provided around the rotation axis of the gear part and rotates together with the gear part; Lock the pinch roller,
The pinch roller cam engages with the groove portion of the pinch roller cam, moves in the direction of the rotation axis as the pinch roller cam rotates, and engages with the cam groove of the main cam gear when the limit point of the movement is reached. and a pinch roller unit that rotates about the rotation shaft by rotation of the main cam gear and presses the pinch roller against the capstan.