JPH064934U - Pinch roller device - Google Patents

Abstract

(57) [Abstract] [Purpose] A pinch roller consisting of a rubber-like elastic roller and a bearing part is rotatably attached to the pinch roller shaft.
The present invention relates to a pinch roller device in which a roller case is fixedly held at both ends thereof. [Structure] A spiral groove is formed in the axial direction on the inner peripheral surface of the bearing portion that contacts the outer peripheral surface of the pinch roller shaft, and a viscous lubricant such as grease is applied to the spiral groove. During rotation, the pinch roller is always biased in one of the axial directions by the action of the spiral groove and the viscous lubricant, thereby preventing the pinch roller from swinging up and down and realizing the stable running of the tape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a pinch roller device in a magnetic tape running mechanism such as a tape recorder or a tape player, which performs tape feeding at a predetermined speed by a cooperative relationship between a capstan and a pinch roller device.

[0002]

[Prior art]

 Conventionally, a general pinch roller device of this type is a roller that is rotatably attached to a support shaft 2 that is vertically provided on a base body 1 as shown in FIG. 1, and is normally urged by a spring member in the capstan direction. A pinch roller 9 composed of a rubber elastic roller 7 and a bearing 8 is rotatably attached to a case 3 and a pinch roller shaft 6 fixedly supported between an upper plate 4 and a lower plate 5 of the roller case 3. In addition, the pinch roller 9 is pressed against the capstan by moving the roller case 3 in the capstan direction by a separately provided operation means or the like.

[0003]

[Problems to be solved by the device]

 However, in this type of pinch roller device, since the pinch roller shaft 6 is fixedly held between the upper plate 4 and the lower plate 5 of the roller case 3, the upper surface (or the lower surface) of the pinch roller 9 and the roller case 3 are fixed. Voids 10 and 11 were formed between the upper plate 4 (or the lower plate 5) of No. 3 and the pinch roller 9 was caused to move slightly in the axial direction when the tape was running. That is, the pinch roller 9 causes vertical deflection (vertical movement), which impairs the stable running of the tape and deteriorates the recording / reproducing performance.

Therefore, in order to prevent the vertical movement of the pinch roller 9 of this type, a technique of disposing a leaf spring between the pinch roller 9 and one of the upper and lower plate surfaces of the roller case 3 has been proposed. However, there was a drawback that extra parts and man-hours were required when assembling the pinch roller device, and the assembling was complicated.

The present invention has been proposed to solve the above-mentioned problems of the prior art, and includes the upper surface (or lower surface) of the bearing portion 8 of the pinch roller 9 and the upper plate 4 (or lower plate 5). The axial deflection of the pinch roller 3 during traveling, which is caused by the gaps 10 and 11 existing between the gaps, is reduced by a simple structure.

[0006]

[Means for Solving the Problems]

 The present invention relates to a pinch roller device in which a pinch roller formed of a rubber-like elastic roller and a bearing portion is rotatably attached to a pinch roller shaft, and the shaft is fixed and held in a roller case. In the magnetic tape running mechanism, a spiral groove is formed on the inner peripheral surface of the shaft hole of the bearing portion 8 in contact with the outer peripheral surface of the roller shaft, and a viscous lubricant such as grease is applied to the groove. It is intended to provide a pinch roller device.

[0007]

[Action]

 The operation of the present invention having the above structure is as follows.

That is, since a spiral groove is formed on the inner peripheral surface of the shaft hole of the pin bearing portion that is in contact with the outer peripheral surface of the pinch roller shaft, and a viscous lubricant such as grease is applied to the spiral groove, the pinch roller is connected to the pinch roller. When the shaft is rotating at a constant speed around the shaft, the action of both causes the bearing, that is, the pinch roller, to be constantly pressed in one direction (up or down) on the pinch roller shaft. There is no vertical runout and stable tape running can be achieved. In this case, the viscous lubricant such as grease is effective for displacing the pinch roller in the rotational axis direction especially when the rotational speed of the pinch roller is relatively low such as when running a tape for audio.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be specifically described with reference to FIGS. In addition, the same acting parts as those of the conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 2, 9 is a pinch roller composed of a rubber elastic roller 7 and a bearing portion 8, 6 is a pinch roller shaft to which the pinch roller 9 is rotatably attached. The pinch roller shaft 6 is fixedly held by the upper plate 6 and the lower plate 7 of the roller case 3 with its shaft ends. The roller case 3 is rotatably attached to a support shaft 9 hung on the base body 1, and is normally urged by a spring member toward the capstan 12, and the roller case is operated by a separately provided operation means. The case 3 is moved so that the roller 7 of the pinch roller 9 is sandwiched between the tapes 13 and pressed against the capstan, and then separated. Reference numeral 14 is an outer peripheral surface of the pinch roller shaft 6, 15 is a spiral groove formed on the inner peripheral surface of the shaft hole of the bearing portion 8, and 16 is a viscous lubricant such as grease applied to the spiral groove 15.

FIG. 3 is a vertical cross-sectional side view of the inner peripheral surface of the shaft hole of the pinch roller bearing portion 8 in which the spiral groove 15 is formed. The spiral groove 15 is not required to be formed on the inner peripheral surface near the upper surface and the lower surface of the bearing 8 in order to prevent the grease from leaking out from the shaft hole of the bearing 8.

A pinch roller of the present invention is used for an auto-reverse type tape recorder or the like in which a pair of pinch roller devices are used and the rotation direction of each pinch roller is switched to perform tape traveling in the forward and reverse directions. When the apparatus is applied, it is desirable that the spiral grooves of the respective pinch rollers are formed so that their inclination directions are opposite to each other so that both pinch rollers are biased to the same side.

[0013]

[Effect of device]

 As described above, according to the present invention, the spiral groove 15 is formed on the inner peripheral surface of the shaft hole of the pinch roller bearing portion 8 in contact with the outer peripheral surface 14 of the pinch roller shaft 6, and the viscous lubricant 16 such as grease is provided therein. Since the coating has been applied, when the pinch roller 9 is rotating around the pinch roller shaft 6 as a support shaft, the action of the two causes the bearing portion, that is, the pinch roller 9 to move in one direction (up or down) on the pinch roller shaft. ), The vertical movement of the pinch roller 9 is eliminated, and the tape can run stably.

Further, the viscous lubricant 16 such as grease attached to the spiral groove 15 has the effect of smoothing the rotation of the pinch roller 9 and preventing the inner peripheral surface of the bearing portion 2 from being worn. In particular, when the pinch roller shaft 6 is made of a metal material and the bearing portion 8 of the pinch roller 9 is made of a synthetic resin material, the eccentric runout of the pinch roller 9 due to abrasion is effectively prevented.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an example of a conventional pinch roller device.

FIG. 2 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 3 is a sectional view of a bearing portion according to the present invention.

[Explanation of symbols]

 3 Roller case 6 Pinch roller shaft 7 Elastic roller 8 Bearing part 9 Pinch roller 15 Spiral groove

Claims (1)

[Scope of utility model registration request] 1. A pinch roller including an elastic roller and a bearing portion is rotatably attached to a pinch roller shaft, and
In a pinch roller device that is configured to fix and hold the pinch roller shaft in a roller case, a spiral groove is formed along the axial direction on the inner peripheral surface of the shaft hole of the bearing portion that contacts the outer peripheral surface of the pinch roller shaft, A pinch roller device in a magnetic tape running mechanism, characterized in that a viscous lubricant is applied in the groove.